i havn't been through this myself but i know several married couples that at about age 60 on split up, even with several children, i guess they feel they don't have much time left and wish for something better or different thinking the grass is greener on the other side. your mom sounds like she is getting herself deeper and deeper into trouble, she will have to see for herself, so i would just talk to her about it and warn her of the consequenses of her actions.