My DFiancee (only child) lived with his parents until we moved in together 2 years ago at 26. Since then his mum seems to have suffered with mild depression as a result of him not living at home. She wants him to come back to visit them every week, and has been known to emotionally manipulate him into doing so ('we looked after you so now you need to look after us', 'how would you feel if something happened to us'). She doesn't do anything with her life apart from work and watch TV, and doesn't seem happy in life at all. Her husband works long hours so is rarely around. Recently she text him multiple times while he was at work saying that he needed to go and visit them right that second as there was an emergency. In reality, they just needed help filling in a few forms. They come from a place where to see your family every week is the normal thing to do. We have suggested hobbies that she could take up, but she isn't interested.
I really resent them emotionally manipulating my DFiancee, he is incredibly busy, working 12-14 hour days at the moment, and so to go and visit them 1.5 hours away is tough on him. I barely see him, and so our free time is precious to us.
However I feel this huge amount of guilt that because of me, she is struggling so much mentally.
What is the right thing to do in this situation to make everyone happy?