Of course you could advise your son of your intentions and ask him to move out and find somewhere of his own, hopefully well in advance of any demise on your part although that may be difficult if he is currently unemployed. However, he knowledge that your house will definitely be sold over his head at some point if he's still unemployed may act as an incentive for him to become independent again as quickly as possible. On the other hand, if you risk becoming elderly and infirm, you may appreciate his presence living with you to help you and if that ends up being the case you may wish to enter into some kind of understanding with the rest of your potential beneficiaries that you son is allowed some time to find alternative accommodation after your eventual demise, i.e. 12 months, rather than a rushed sale going through to enable everybody else to benefit.