Due to my ex now living with a ex heroin addict who now is apparently on a methadone treatment plan I decided to only allow our 12 year old son to sleep at his mothers 1 night per week. More importantly this is what my son wants too as it's very stressful for him to be at his mums. There's also a lot of debt there and she relies on my maintenance payments.

When he stays there for the night all his mum and her boyfriend do is try to make him feel guilty for not wanting to be there. They do not appreciate how he feels and I think they fear that the more he is at mine the less maintenance I have to give my ex. These guilt trips are upsetting my son. How can I try to deal with this?