Hey Maus, thanks for going to all that trouble to show me the picture. It worked for me and I could see that the sim you've tested on has the Makes No Meshes trait. A very cool way.
Perhaps I've not searched for it the right way. You told me to watch the family tree when the sim was going on vacation, right? I had let a sim going on vacation and at the moment he was about to travel (while still being in his house) I've paused the game and looked in the family tree. No I see your sim IS actually on vacation. That was my mistake perhaps.
I will try this again later this day. Thanks for explaining this. How did you find this out to work actually? It's not something I would have thought about myself right away.
If a sim who has a hidden trait got a child who didn't inherate any and that child got another kid, is it possible for that kid to inherate a hidden trait from his grandfather, even while it has skipped a generation?