My adult son and his girlfriend live together and have happy lives and good jobs. Randomly I get a call from them saying they are planning on ditching their current jobs and getting new ones and moving in with us to save money for a deposit to be able to buy their own place. They wouldn’t be able to travel to their current jobs from our house due to longer commutes. They have accumulated their own house full of possessions and pets, they have no children. I was not expecting this at all and am annoyed that they have made a huge decision without discussing it with us first. I feel railroaded into helping them and annoyed that they have made this assumption. My DH has been DS DSD for over half his life has told me no as it is impractical and has left me to have the conversation with them. I want to help them and feel guilty if I consider not helping them, but I have to also consider the huge impact it would have on mine and DH lives. DS has said they will live in the garage and have told us they will pay a token £50 a week in rent so that they can have maximum opportunities to save. I couldn’t bear to have them in the garage but we don’t have a bedroom for them as DH and I need separate bedrooms for health issues. AIBU to say no to their idea? Do I just ignore it as they might be running through the practicalities of various ideas? Are they being CF by assuming they can disrupt our lives? Am I horrible for not wanting this to happen? They want to pay for storage for their house full of possessions which will eat into a huge chunk of their money. I feel awful for wanting to say no to them but I don’t see how this can work day to day and long term. DS GF has a notoriously troublesome family that have said they can’t wait and will be here visiting all the time and I just don’t want all the disruptions. WWYD?