ExH and I split amicably almost 2 years ago and have 2 DD's. He pays me maintenance based on having them 3 nights every week and it has worked well for everyone since we split.
Recently ExH has started letting his mum have the children overnight on some of his nights, probably around once a week. The children are happy with their grandparents so I don't mind I just think ex should be paying more maintenance now he's only having them twice a week? I've tried to ask him for some more money and he says he doesn't have to pay anymore. Is this correct? He can use his family members on his contact days and it still counts that he's had them 3 nights?