How many kids do you prefer to have per couple?

I picked two but I've been known to have more. My current save, my Sim had her daughter, Selena, then adopted a baby boy, Edgar, who turned out to be black (Afri-Sim?) so they adopted an Indian child, Sumit, as a companion. Before they aged up and moved out, Selena had a bit too much eggnog at Winterfest and got frisky with Father Winter, ending up with twins Nicky (short for Nicholas) and Kris (Kris Kringle). She's still living at home because she's the eventual family heir (the goal for this family is to complete as many of the collections as possible -- so far I've got the snow globes, the city posters, the elements, the feathers, and just finished both the gardening and geodes collections)/