"This is inappropriate", says my Sim's father

@SheriGR  I've since done the Party Animal aspiration, so I feel like I've mostly gotten the hang of it, but I still find Kava Parties (for Beach Life) to be, ironically, the most stressful.  LOL!  Once you get the Party Animal reward trait (Perfect Host) and/or a good reputation from the Get Famous pack, it's a lot easier.  It still won't let you bake a wedding cake at your new in-laws' house, though!  😉  (Always Welcome.  Yeah.) 

While hilariously awful, that wedding's not the worst social event I've thrown.  While I was doing Party Animal with my Super Sim, a guest decided to go swimming in the snow on New Year's Eve and died.  Nooooo problem! I thought, and had Mom Transportalate up to Grim with a death flower... but she decided to witness death instead of giving it to him (autonomy, sigh).  Because we're attached to Brent Hecking, we spent the rest of the party Necrocalling and Dedeathifying him and earned a bronze.  I made sure he was properly back in his own household and married to Brant again, and had him comfort Brant.  At two AM, they both had popups of "New Year's Eve was AWFUL!"  Sweeties, you said a mouthful. 😉  (They're still marked played in that save. And yes, I had EVERY life insurance possible on hand, lol.) 

@EeveeTinnYeah, I would really love to see the game acknowledge family ties outside the current household for more than who you can or cannot date.  Like, yeah, Grandma can cook in my kitchen if she feels like it, as can adult kids who moved out.  Also, cooking is inappropriate but other Sims come over and take mud baths in my tub and other things that are, IMHO, a lot more inappropriate than baking cakes.  I had one married couple consummate their marriage in grandma's bed! fortunately, grandma never found out, lol!