The 1st grandsimmy has arrived. Gila Reptiles had a relationship with my sister's Apocalypse sim Sol Terrano that resulted in a daughter. Star Reptiles was thankfully born with white skin, not her father's green skin. I don't think I could have kept her if she had been green. Sol also knocked up Gila's sister, Boa, but Boa died in a kitchen fire before giving birth.
My 1st generations are starting to age to elder. The Mammals and the Birds are already elders. The Reptiles and the Insects are close. None of the children are adults yet, but I have the Teen-intimater so my teens are having adult-style relationships, woo-hoo, and even babies already. Star is the only 3rd generation birth, so far though.