The Annoyed Man wrote:Beggars can't be choosers, and I am not inclined to help people who do not respect me.
Yep. If they want your help, they are the ones who need to bend a bit. It is not reasonable to ask for you to provide free labor and then mandate the conditions under which you provide it. Generally speaking, unreasonable people will be as unreasonable as they can be while still getting what they want. You have to decide how unreasonable you are going to allow them to be and your MIL will scale her attitude to adjust.