The Official The Sims 4 100 Baby Challenge [UPDATED ON DEC 29, 2018]

I'm about 7 babies into my challenge right now and I love it! The only problem I seem to be having is that my matriarch can't seem to maintain relationships. She'll meet someone and once they leave the relationship disappears and she has no way of contacting them again. It makes it hard to meet potential fathers. She has to meet the fathers and make the babies all in one day. Is anyone else having this issue? Is there any way around it?