Do you need to do sub-challenges with the same sims?

[Bagel_Bear]

For example for All You Need, do you need to use the same two sims the whole time from children best friends to married adults?

[APriceless]

No, you do not. Obviously some you are better off using the same. Like in your example, in All You Need, you could use the same Sims to get engage and have a wedding. But no, you can use multiple sets of Sims.

[Bagel_Bear]

Thank you for your response. My reasoning is that I am just going to play the game normally with my desired household then once I do mostly everything I can with them I'll make more households to complete what isn't done yet.