@2005CoppyCat I've found this just to be a feature of the game, presumably becuase of how the tree/relationships are coded or data reasons; I've found if you go higher up the tree e.g. if Diego and Emilia had parents/a parent, if you clicked on them for their geneology, it would likely bring up all of the children and grandchildren. I find it frustrating that that's the only non-mod way I've found but there's multiple mods if you seach up sims 4 better family tree mods such as the No Disappearing Relatives in Family Tree by Tremerion but honestly I just use an external option for the family trees these days
