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幸福生活从优生优育开始。
优生在游戏中是指娶带有天生特质的角色，来把这些特质传给你的继承人。这些特质是与生俱来的，并且在
游戏中的其他角色身上也不常见。
这些特质也有好有坏，其中正面的天生特质十分强大，能给角色带来极好的加成。将天生特质带入你的家族，这是优生要做的事情。
婚姻
- 主条目：婚姻
因为正面天赋在游戏中是比较稀有的，玩家大多数时候需要从外面的世界获得他们；同时尽量[[Traits#Genetic|]负面天赋特质]来到你的家族。正面天赋特质有小概率会在你的家族中遗传很长一点时间；而糟糕的负面天赋特质同样也会在一段时间内困扰着你的家族。如果玩家的角色不幸携带了负面天赋特质中的其中一个，他可以尝试娶一个带有与该负面特质相对的正面天赋特质的配偶，从而减少你的继承人携带该负面天赋特质的几率，避免因为负面天赋特质带来的属性减益。
如上所言，当你在使用
角色设计器时，给你的人物加上一些负面属性（比如
足内翻或者
口吃）会稍微有一点用，因为他能给你的人物省一些属性点，你的孩子们有85%的属性不会继承这些负面属性。
因为天赋特质是随机的，想要让具有正面天赋属性的孩子上位，你需要以下的任意一种方式：
即使父母双方都有
天才特质，也无法保证后代就一定也会是天才，但出现概率会大大增加；两个天才父母生下三个儿子，至少有一个是天才的几率是~66%
怀孕
一对夫妇的生育能力决定了受孕的可能性。当DLC
御前会议被激活时，推荐使用野心培养一个继承人，这会增加你+20%的生育能力；当DLC御前会议未被激活时，野心
得到一个儿子/女儿会增加你+25%的生育能力。
也可以通过事件来使你的夫人
怀孕。举个例子，男性角色因为长子的死感到愤怒，就可能触发类似事件；
勾引重心也有类似事件。
受孕两个月后，玩家会得到提醒，他的夫人获得了怀孕特质；再大约七个月后，一个孩子就出生啦。
怀孕中的女性角色会失去一些属性，如果她是统治者，那么在生育前的几个月中会触发摄政。
游戏内设置了一个参数FERTILITY_BASE_MULT来控制怀孕几率，关系如下：
| 关系 | 修正值 | 属性值 |
|---|---|---|
| 平妻 | 0.5 | SECONDARY_SPOUSE_FERTILITY_MULT |
| 情人 (不是婚姻关系) | 0.5 | NOT_SPOUSE_FERTILITY_MULT |
| 妻子 | 1.0 | NOT_SPOUSE_FERTILITY_MULT |
| 妻子兼情人 | 1.5 | MARRIED_LOVERS_FERTILITY_MULT |
注意，在文明的中世纪，很多婚姻并非出于爱情，而是父母之命媒妁之言。在游戏中，有几率触发事件让你爱上你的妻子，这是你的妻子就会同时成为你的情人，表明你们俩之间有真爱。
Birth
Essentially, everything is decided at birth and not at conception:
- Child's sex is a simple 50/50% chance
- As for congenital traits, each have an inheritance chance built in, which ranges from +15% to +50%
- There is a small chance of genetic traits randomly showing up at childbirth despite neither parent possessing any trait
- The baby may get the
trait and the mother may die while giving birth - Whether or not a pregnancy results in
, it is decided at conception; all of the twins' traits (including their genders) are decided at birth, as usual.
Note: Some genetic traits can also be acquired later in life, such as getting 
from one of the outcomes of a childhood event.
近亲繁殖
Characters whose parents have shared ancestors are at risk of being born with the 
trait, severely limiting their skills, fertility, and lifespan.
The risk is higher when the parents are more closely related (specifically, with more shared ancestors). As such, it is recommended to maintain a high degree of separation when marrying and avoid union between close relatives, unless there is a significant advantage.
The chance of the and 
traits depends on the number of unique ancestors the child has in the past five generations (the first of the five generations being their parents), with a 0% chance of both when all ancestors are unique, rapidly increasing as the number of ancestors shrinks. Missing ancestors (i.e., characters without parents) are assumed to all be unique.
| Number of unique ancestors | Chance of |
Chance of
|
|---|---|---|
| At least 32 | 0-10% | 0-2% |
| 28-31 | 23.25-25.5% | 4.65-5.1% |
| 23-27 | 35-39% | 7-7.8% |
| 18-22 | 80-88% | 16-17.6% |
| 17 or fewer | 100% | 27-36.6% |
Once inbreeding has taken root, it has a 25% chance of being passed on to the affected character's children (assuming this marriage is not also incestuous, in which case it is amplified by the above chances), therefore, it is difficult to uproot.
Inbreeding is also a major concern for Zoroastrians and others who benefit from incestuous marriages. Thus, 
becomes particularly important for them.
Non-congenital lineage traits
Muslims
The 
trait is based on agnatic descent from close relatives of the Prophet Muhammad. If a character marries a woman possessing the trait, her sons will be 
. However, a 's child will not become . Because each of these traits offer a +5 opinion bonus with all Muslims and make it easier to become a Caliph, they are desirable for Muslim rulers.
If the player is not running a dynasty, it is very difficult to breed it into the dynastic line. The player is required to invite a into court and pass the Notable Status of Women law so the player will be able to form a 
, or convert the character to a religion that allows for such a marriage. Next, the character should be married matrilineally to a woman of the player's dynasty. If a male child of this union inherits, the dynasty will have the trait from this point forward.
Bastards
- 主条目：Bastard
Children born outside of marriage or are considered bastards. Initially, they have the 
trait, preventing them from inheriting or passing on the dynasty of their parents. However, a parent can choose to make them a 
, allowing them to inherit, but the -1 
diplomacy attribute penalty remains.
Byzantines
Children born to a ruling Emperor of the Byzantine Empire automatically receives with a +5 vassal opinion bonus and priority in succession.
Children of concubines
- 主条目：Polygamy
Children of concubines get the 
trait. They can inherit normally but incur a -1 diplomacy attribute penalty.
Zoroastrians
A Zoroastrian ruler who fully controls the Persian Empire can earn the 
trait. All of their descendants benefit from the 
trait, regardless of gender.
Castes
- 主条目：Caste
Most characters following Dharmic religions are assigned to one of three castes:
Each caste has a different advantage, but followers of the Hindu religion have -30 opinion penalty toward rulers whose caste does not match their holding type. Children inherit the lower one of the castes their parents have.
List of genetic traits
Positive
| 名称 | 键值 | ID |
|
|
|
|
|
健康 | 出生 % | 继承 % | 好感 | 其他修正 | 杂项 | 花费 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
魅力非凡 | fair | 53 | +1 | 1% | 15% | +30 吸引力好感 | 与  相反
|
16 | ||||||
|
|
天才 | genius | 56 | +5 | +5 | +5 | +5 | +5 | 0.5% | 15% | +5 封臣 | +10 个人实战能力 +30 理性 |
解锁聪明的伏击作战战术。 与  ,  和  相反
|
30 | |
|
|
敏锐 | quick | 57 | +3 | +3 | +3 | +3 | +3 | 1% | 15% | +5 个人实战能力 +15 理性 |
解锁聪明的伏击作战战术。 与 , 和 相反
|
15 | ||
|
强壮 | strong | 61 | +1 | +2 | +1 | 1% | 15% | +10 吸引力好感 +5 封臣 +10 部落 |
+10% 生育能力 +10 个人实战能力 |
与  相反
|
25 |
Negative
| 名称 | 键值 | ID |
|
|
|
|
|
好感 | 出生 % | 继承 % | 好感 | 其他修正 | 杂项 | 花费 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
|
足内翻 | clubfooted | 48 | -1 | 0.5% | 15% | -10 吸引力好感 +5 同一特质好感 |
-5 个人实战能力 | -4 | ||||||
|
侏儒 | dwarf | 55 | -1 | 0.25% | 25% | -30 吸引力好感 +5 同一特质好感 |
-15 个人实战能力 | 如果父母都有 特质，继承几率增加到50%。与  相反
|
-14 | |||||
|
兔唇 | harelip | 49 | -1 | 0.5% | 15% | -10 吸引力好感 +5 同一特质好感 |
-4 | |||||||
|
驼背 | hunchback | 50 | -1 | 0.5% | 15% | -30 吸引力好感 +5 同一特质好感 -5 封臣 |
-19 | |||||||
|
|
痴呆 | imbecile | 59 | -8 | -8 | -8 | -8 | -8 | 0.5% | 15% | -30 吸引力好感 -10 封臣 |
-30 个人实战能力 -30 理性 |
与 , 和 相反
|
-65 | |
|
|
近亲缺陷 | inbred | 60 | -5 | -5 | -5 | -5 | -5 | -1.5 | 25% | -30 吸引力好感 -10 封臣 |
-30% 生育能力 -20 个人实战能力 -20 理性 |
如果父母都有 特质，继承几率增加到50%。
|
-71 | |
|
|
口齿不清 | lisp | 51 | -1 | 0.5% | 15% | +5 同一特质好感 |
解锁军令费解作战战术 | -1 | ||||||
|
|
迟钝 | slow | 58 | -3 | -3 | -3 | -3 | -3 | 1% | 15% | -5 个人实战能力 -15 理性 |
与 , 和 相反
|
-15 | ||
|
|
口吃 | stutter | 52 | -1 | 0.5% | 15% | +5 同一特质好感 | 解锁军令费解作战战术 | -4 | ||||||
|
|
丑陋不堪 | ugly | 54 | -1 | 1% | 10% | -20 吸引力好感 | 与 相反
|
-11 | ||||||
|
|
虚弱 | weak | 62 | -1 | -1 | 1% | 15% | -10 吸引力好感 -5 封臣 -10 部落 |
-5% 生育能力 -10 个人实战能力 |
与 相反
|
-22 | ||||
|
|
巨人症 | giant | 327 | -0.5 | 0.5% | 5% | +5 封臣 +10 部落 -5 吸引力好感 |
-20% 生育能力 +10 个人实战能力 |
与 相反
|
||||||
|
左撇子 | lefthanded | 337 | 0.75% | 25% | +5 同一特质好感 -10 基督教教会 -10 伊斯兰教 |
+15 个人实战能力 |
Strategy
In order to deal with dynasty characters with negative genetic traits, the following actions may be taken into account:
- If descendants are in the line of succession: The player could try to disqualify them from succession
- If descendants are not in the line of succession: It is much easier to just arrange a marriage into other important dynasties, which also has the possibility of introducing the defect into those dynasties' gene pools. In the long term, this "infection" has the potential to erode their power through generations of dysgenic leaders.
- Alternatively, if no options for disinheritance is available, one might attempt to liquidate the unprofitable assets.
Summary
- Avoid marriages among close relatives; ensure that the groom and bride at least do not share any grandparent
- Avoid marriages with spouses bearing negative genetic traits
- Look for candidates of marriage who possess positive genetic traits
- Should the player happens upon a negative genetic traits, it is possible to marry spouses with positive traits opposite in effect to it (e.g., as opposed to ), for it will decrease the chance of heirs receiving a large hit to their stats.