it only works with Lil, at least did when was at it, aunt have to be sleeping overnight and then you invite lil to dinner and should see the option when on the way
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and cant check ingame atm anything cause my pc died and this old shit is barely running as it is.
Ok. I give a key from my room to aunt. then she slept there for 1 day.
Next day she want to give the key back to me, i say 'no, take it yourself' and this day i go to sfamily with Lil and there is a screen but without possibility to press Invite.