This is basically the same setup as mine, except I built a grocery price crawler, that spits out a weekly menu along with a check-box shopping list straight into my google drive. Wife loves being able to just type "we need toothpaste" or whatever into Telegram and whenever we go to do our weekly shop we get an up to date shopping list optimised for prices and our dietary preferences.

Before getting side-tracked by other projects I was also going to build a kind of family archiving function like someone in the comments also mentioned. Just to quickly be able to record small/funny family moments.