Sidney asked his girlfriends mother to prom...
... but at least it was as friends? https://i.imgur.com/HCkeGLl.png
Forum Discussion
I think the patch that just launched might have solved the issue:
Source: https://www.ea.com/en-gb/games/the-sims/the-sims-4/news/update-08-30-2022
Sims will correctly direct their prom invites to the Sim they intended to ask, not the Sim currently controlled by the player.
Source: https://www.ea.com/en-gb/games/the-sims/the-sims-4/news/update-08-30-2022
