I am playing on the PC version of the game, no mods, and my Sim can't teach either of her two children any family recipe. Previously it was only the daughter who she couldn't teach but it has now changed so it is both of them.
It seems like when they were children there was a negative sentiment for a time, but even though the sentiment has ended, they still can't teach them. I've been trying since they were children, both are now young adults. I think the same thing has happened with the son whereby, even though their relationship is really good, they've had a one off negative sentiment and now they're locked from ever teaching them recipes.
Any help would be greatly appreciated.
Edit By Crinrict: Added pack tag to title.