How have you settings at Sims 3: lifespan, seasons, moon cycle?

Hi everyone! I've recently got into the sims 3 as I haven't played it in years and finally have the money to buy a few packs. I have generations, pets, season, supernatural and ambitions. I would really like to experience having grandkids in this game as the sims 4 is very tricky to do so and fulfil the gameplay at the same time. What settings do you have to each sim life stage and what do you have your seasons to get the chance to have grandkids if the child sims where to have babies in their early Adults (Not YA) stages?