It's a long one sorry
I recently went on a UK cottage holiday with my two sisters their partners my niece (14) and my two children.
"DH" was supposed to come with us too but since booking we have separated.
I have two young children and only decided to go last minute because I was assured of help with them and they didn't mind etc
My oldest boy is copying everything at the moment and DN kept putting her middle finger up at him and teaching him swear words
My youngest is still in a bassinet and my DN took him for a walk while I was doing bedtime with the older one.
When I came back from bedtime baby was screaming his head off niece was marching back down the driveway jolting the pram and then pushed the pram at me telling me to fuck off with my screaming kids.
I calmed baby down and then went to check she was ok and if she wanted to talk about it.
I asked her not to swear/show him the middle finger and she told me she would do what she liked as it was her holiday and I shouldn't be there.
Overnight I packed up our stuff and left with the children at first light.
I told my sisters & their partners of my plan to leave and left before everyone woke the next morning.
Since everyone has been back my sister has asked me to look after DN overnight a few times or to come here for coffee and I've said no for my children's safety.