Step son - Mike, and his wife, Jane, are divorced. One child, Belle. (I can't stand all the abbreviations, can't follow...). They don't live particularly close to us, but see Mike's mum Louise (my husbands ex) regularly.
Mike had Belle this weekend, and came to our house. Mike had to run some errands, so left Belle with me for a couple of hours. She is 8. Not a problem, we played games, did crafts. Later yesterday, Mike took Belle to a birthday party, and then back to ours for bed.
Which brings me to today, Sunday. My husband and Mike took Belle to see her great grandmother this morning, whilst I prepped Sunday lunch.
Roast beef, yorkies, veg, roasties….
Belle tried to cut her potatoes, but held the fork like a dagger (made a fist, fork held in it if that makes sense) and the knife like a pen. Obviously it wasn't working very well! I showed her how to hold them correctly. She tried, but went back to her way. Mike told me to leave her, it didn't matter. She was then sitting with her knee up on the chair, against the table - I asked her to sit properly. Again, glares from Mike. She got up as soon as she finished eating, but not having finished her meal. I told her that it was polite to 'ask to leave the table', not just get up. Mike told me 'we don't bother with that'.
So, AIBU to insist on table manners - sit properly, use the cutlery properly? TBH, I can't believe that her mother Jane, and Louise don't seem to enforce these?