Which one would you chose.....your wife or your mother?

This situation was faced by a friend of mine. He has been married about 15 years to the same woman. His mother suddenly became ill and required his attention everyday, in order to feed her and take care of her personal business. My friends wife became jealous, because he was paying more attention to his mother, rather than her. In-home nursing was not a possibility and a nursing home was not financially possible, either. His dad is deceased and there is no other family member healthy enough to assist my friend with his mother. Question: Since my friend is on the brink of divorce, which person should he chose to be with? His wife or his mother and why?