Update:
There's a patch today that addresses the issue with losing relationships after entering build mode from map view.
EA StaffThank you @Sysomi !
Do you remember what you were doing in game prior to noticing that the relationships were gone?
Yes. Right before the patch, I was making a library for them to have a sunday read time with my main household: Grandma, her son, his husband and their twin daughters. I had stopped right before their morning routine and moved over to the lot to make the library. I logged off in the middle of making the library, logged on and continued to make the library and check out the new roofs. About an hour later, I was done and when i went over to go ahead and send the family, they didn't know each other. At first, I couldn't click on my toddlers at all. I tried clicking from one husband to another and that gave introductions. I then checked their relationships and found they were all gone. I introduced them and they were strangers but married with the new marriage buff. I introduced them to the children and grandma and saw this post. I decided it was annoying but something that i could work around since i had poured months into this family and either other families to supply the stores, restaurant and other lots and play dates I wanted them to have. I just began cheating the relationships back to where they were and trying to fix my clubs and friends. That's when I noticed the sisters still didn't know each other. They can't click on each other. Ok. Cheat them. They have their relationship but they still can't click. They can play at the doll house together but still can't talk to each other. I tried the repair too. Nothing.
