Vault dwellers (Fallout Shelter)

https://fallout.fandom.com/wiki/Vault_dwellers_(Fallout_Shelter)

Adult male and female dwellers in living quarters meet, talk, dance, and mate; related dwellers cannot mate except cousins, aunts and nephews, uncles and nieces; children become assignable adults three hours after birth; children have a 50% chance of inheriting either parent's highest SPECIAL stat, and maxed parents can produce higher-stat children; happiness rises with job fit and partners and falls with shortages, illness, and bodies left in the vault; survival mode forbids revival.

Fallout Shelter