I'm sure the way she acts is because her mom never told her to say thank you and please and all the niceities we are taught when we are young.
It appears your sister isn't teaching the children the manners they need and considering she doesn't have custody of 2 of them, someone else should be teaching them.
She will probably know when she gets older that she needs to be thankful but I really hope her mothers bad habits don't get picked up by her because that just would be really sad.
I would keep doing nice things for your sisters kids when you want to and not to expect anything in return. Just do less than you used to but it seems like they still need some happiness in their life.
It appears your sister isn't teaching the children the manners they need and considering she doesn't have custody of 2 of them, someone else should be teaching them.
She will probably know when she gets older that she needs to be thankful but I really hope her mothers bad habits don't get picked up by her because that just would be really sad.
I would keep doing nice things for your sisters kids when you want to and not to expect anything in return. Just do less than you used to but it seems like they still need some happiness in their life.