His Mother Has The Proper Viewpoint
It’s understandable if your parents are a little heartbroken when you move away from them. They definitely want you to come back as frequently as possible. While they may believe they should pay for it, we aren’t sure.
Her son’s mother has the appropriate outlook. That her kid expected her to foot the bill for their visit is a little much. Is it OK if they offer, but not acceptable if you accept?