My now exwife moved in with her mother (all planed in advanced) along with our two children and now she claims she payed

(along with rent ) her mother child care and she wants me to pay for half of her mothers services so a stack of recites appears over night with her mother signature.Do I have to pay ? It states child care in our agreement but I tought it meant summer camp ete.... notfamlry members that voluntarily except the reasonabilty of the children. Am i wrong (New York) - Is this your question? Add additional information