I have 2 DC (aged 5 and 7) and have noticed that my friend is getting rather bossy towards them, including when I'm there and we're at my house.
Things like telling my kids they're not allowed a biscuit (I let them have biscuits as a treat, ok in moderation), telling them they're not allowed fizzy drink (I get them Fanta from time to time as a treat, certainly not every day) and other such examples.
I'm always saying "it's ok Sarah (not her real name btw), I've given them the cup of Fanta or biscuit" then she's saying how terrible such things are for their teeth and how her DC would never be allowed to drink fizzy drinks.
That causes her DC and mine to clash. Mine teases hers by saying I'm allowed but your not, or hers might tease mine about having too much sugar and getting fat/teeth rotting (none of which are even remotely on the horizon btw).
I find her a bit overbearing towards my DC. I know she means well but like just accept that I'm their parent.