Married Sims becoming siblings

Ever since I bought the Small Business back when it came out my game has been glitching so much. No matter what I do my married sims keep becoming siblings. It’s triggered out of nowhere. One minute my sims could be woohooing in the sky (fairy pack) and the next second their siblings. I’ve played lineages and then loose everything. This is becoming such a problem that I’m rethinking playing these games and getting refund on a pack I just preordered how can I play if I the game keeps glitching.