Whenever I ask my Dad to do something, he does it. If it's my mum he doesn't listen. My mum is a triple by pass heart patient, everyone tells her to take a rest whenever she can but she doesn't. She can be stubborn. My dad accuses my mum of nagging him when he does something he shouldn't, he's got incontinence of urine and wakes frequently at night disturbing my mum's sleep. Doctors say if she isn't careful, she will head for a stroke. She's at her wits end. Any advice?