As a favour to a friend whose sons attend the same nursery as my 2 sons . I agreed to take her sons to and fro to school and back. (I'm going anyway, so it's no biggie). However her eldest son has declined to invite my eldest son to his birthday party, her reason-" it's up to my son who he invites to his birthday party)! "I didn't want to get into a paid type of arrangement. I know that she's short of cash, so her job is vital. Her husband doesn't lift a finger to help her with her sons. I'm quite pissed off, and on the point of telling her that my eldest son doesn't want her son to accompany us to school! My husband and 2 close friends have said that I should tell her that our "arrangement" is terminated-she has taken advantage quite frequently re her kids staying for lunch with us,and what not! Any advice?