A family of a character consists of their relatives.
- A character's grandparents, parents, siblings, children and grandchildren are considered Close Family.
- Uncles, aunts, cousins, nephews and nieces are considered Extended Family.
Marriage is the legal union of two characters in a personal relationship. In Crusader Kings III, marriage is only possible between opposite genders. Spouses who are fertile are able to have children. Depending on the Bastardry doctrine of a faith, marriage is the only way to have legitimate children. Marriage is one way to form alliances with other characters.
It is possible to have multiple spouses with the polygamous marriage type doctrine. Also, with the consorts & concubines marriage type doctrine, a ruler can have one spouse along with up to three consorts or concubines.
Marriage is restricted within one's family depending on their faith's consanguinity doctrine. The offspring of two family members may result in inbreeding, and their children have the chance to receive the Inbred trait.
Betrothal is the promise of marriage between two characters. This occurs when at least one of the characters is too young. In order to marry, characters must be at least 16 years old.
Having a lover outside of marriage creates a Lover secret. It it is revealed, it may result in the characters gaining the Fornicator and Adulterer traits, depending of the faith's / adultery doctrines.
Creating a Cadet Branch has the following requirements:
- The character must be blood-related to their current House Head
- The character must not stand to inherit any of their current House Head's titles
- The character must have sufficient Prestige
- All ancestors of the character are dead
If a House Head demands the religious conversion of a House member and the member refuses, it will result in the creation of a new Cadet Branch.
Each character born from a Marriage will belong to the father's House unless the marriage is Matrilineal.
The House Head is the leader of a House. House Heads have the power to legitimize bastards, call House members to war at no cost and demand that they convert to their Faith. In addition, House Heads will get a on all newly born House members. House Heads gain monthly prestige from living and landed members of their house, up to a maximum of +5; +0.02 for every living member, +0.02 for Barons, +0.04 for Counts, +0.06 for Dukes, +0.08 for Kings, and +0.1 for Emperors. When a House Head dies, its Primary Heir becomes the next House Head.
When a character creates a Cadet Branch, they become its House Head, and free from the direct influence of their old House Head unless he or she was the Dynasty Head.
The most powerful House Head of a Dynasty (as determined by military strength) will always become the Dynasty Head upon the death of the current one. Dynasty Head ownership may take up to a year to update on succession. The Dynasty Head gains Monthly Prestige from living and landed members of their dynasty, up to a maximum of +3; +0.01 for every living member, +0.01 for Barons, +0.02 for Counts, +0.03 for Dukes, +0.04 for Kings, and +0.05 for Emperors. The Dynasty Head has access to the following interactions with dynasty members of the same faith:
Renown is a resource accumulated by a Dynasty and is used for the most powerful Dynasty Head interactions, unlocking Dynasty Legacies and increasing a Dynasty's level of Splendor. A Dynasty gains Monthly Renown for the following:
- +0.02 for each living member
- +0.12 for each independent baron
- +0.25 for each independent count
- +0.5 for each independent duke
- +1 for each independent king
- +2 for each independent emperor
- +0.1 for each member married to a baron
- +0.2 for each member married to a count
- +0.4 for each member married to a duke
- +0.8 for each member married to a king
- +1.6 for each member married to an emperor
Firstly, all renown earned by a Dynasty counts towards its Level of Splendor, which determines how known the Dynasty is in the eyes of the world, how much Prestige characters get from being born or marrying into it the maximum long reign Opinion characters can get and how decorated the Dynasty's coat of arms will be. Having a high level also makes it much easier to arrange marriages, especially with Dynasties with a Lower Level of Splendor. The Level of Splendor will never decrease. Peasant Dynasties start at Base Origins.
Dynasty Legacies are permanent modifiers and unlocks that can be unlocked by the Dynasty Head and affect every member of a Dynasty. Each Legacy contains five unlocks, each costing a progressively higher amount of to unlock. If an AI character becomes Dynasty Head it will only unlock Legacies belonging to the tree with the highest current progress.
- forum:1416565/page-2#post-26861541 Meneth's Post in Patch 1.0.3 thread