At least your sister works and her boyfriend brings government subsidy in as a contribution.

You and your fiancé. don’t work at all? Well he does but only part time? Going to therapy is what people do while also having a full time job. I don’t know anyone who can afford just going to therapy and not work. If you are too unwell to work you need to be on disability and receive money from government too. Who supports you two? Who pays for food? Internet? Furniture? 4 years is a long time to not work

If my daughter or my stepdaughter were in a bad situation and needed temporary place to stay of course they’d be welcome to stay with us (not if they choose not to work). But they sure wouldn’t be allowed to bring some men with them. If people can play house, meaning cohabitate with someone, they can get their own place. I am shocked your mother allows all of this

You woke your mother up to complain? All of you do behave like children. If everyone is an adult, everyone needs to ger a job or disability and move out.