Family tree crash since last update

I cannot visualise my family tree I've been working on for 8 years. I suppose it is because there are interfamily marriages, it use to be possible, and now the game can't even open my family tree, it was so precious to me. Please, PLEASE, help me. I play without Mods or CC. I've be trying to make it work for over a week. The game crash and I have to restart my computer.