Once children are grown, their parents are no longer responsible for them.

This picture taken from educationsc represents how even though a child is now grown you were are always going to be what your parents care most about, and how they will always care for you no matter what. In the story Walter does something really horrible when he gives away all of their money, and Mama is furious at first, but in the end she knows that she loves him, and she still cares deeply about her son, especially when he is at his lowest.