Broken family tree

I’ve been playing with one of my favorite families in The Sims for seven years. I loved watching their family tree grow and expand. Unfortunately, the family tree recently 'broke.' Some family lines have disappeared. For example, in the family tree of sims from these 'missing lines,' only the parent shows up, but the grandparent is no longer visible, and there's just a blank icon. I don’t use any cheats in the game to make sure it runs as smoothly as possible.

I’m really disappointed that the family tree broke, as I enjoyed watching it grow. I think the developers should also focus on sim family trees... I don’t think anyone can help restore mine to its original state, but I’d still be interested in hearing other players’ opinions and experiences. Thanks, and have a great day everyone! 🙂