Family relationships
Family Relationships are the bonds between family members. There are special interactions for individual family members in The Sims 2.
The Sims
The family relationships in The Sims are very simple. Two Sims are either members of the same family, or they aren't, and all Sims who live in the same house are considered part of the same family. Even when two Sims marry, what makes them part of the same family is that one moves in with the other. That the two Sims are married is not recorded.
The parent-child relationship does exist, but is not recorded as such. It only exists while the child remains a child. Using the Age of Instant charm or a third-party program to turn a child into an adult will break the parent-child relationship.
Likewise, sibling relationships are not recorded as such. Children living in the same house are considered to be siblings, but if one or more of them is turned into an adult, that relationship will not persist.
Of course, players can define two adults as parent and child, or as siblings, and play them as such, but the game itself will not define any relationship between them.
The Sims 2
The family relationships in The Sims 2 were more complex than the ones in The Sims. Since Family trees were a new edition to The Sims 2, Aunts, Uncles, Nieces, Nephews, Siblings, and Cousins now existed.
List of Family Relationships in The Sims 2:
- Grandparent
- Grandchild
- Aunt/Uncle
- Niece/Nephew
- Parent
- Child
- Sibling
- Cousin
The Sims 3
The overal family relationships in The Sims 3 are very similar to the ones in The Sims 2. A new edition to the family relationships are In-Laws, and Step-Family Members.
List of Family Relationships in The Sims 3:
- Grandparent
- Grandchild
- Aunt/Uncle
- Niece/Nephew
- Parent
- Child
- Sibling
- Cousin
- Parent-In-Law
- Sibling-In-Law
- Step-Parent
- Step-Child
- Step-Sibling
Family Interactions
In The Sims 2, Sims have Interactions that can only be performed with family members.
- Encourage: Using this interaction, a Sim can encourage a younger Sim's behavior and change their Personality. For example, if an older family member encourages niceness, the younger will be kinder to people.
- Family Kiss: Two blood-related or unrelated (somebody who has moved in to join the family but has no relations to any of the family members blood-wise(although they could be a pre-existing sim's love interest)) family members can give each other a family kiss. If a child sim kisses another family member they will wipe their own lips with their arm afterward. If a sim has made their spouse furious at them (e.g. from cheating or arguing), the only kiss they can perform is family kiss (if any).
- Babies: If an infant sim exists in the family a related sim can cuddle and play with them. If an unrelated sim exists on the lot they cannot perform "cuddle" or "play with" only "change diaper" "let [sim name] out" and "get bottle for [sim name].