buying a home with eficted deadbeat tenant stuff inside

Finally after much delay the eviction was executed for a home I want to buy. however the squatter/tenant has his stuff inside. 

long story short. 

mom wants to sell the house, son wont move, she went through eviction process, cops show up 11am, evict him out change locks, they leave, he breaks back into the home about 3pm. cops come and now arrest him for trespass. 2 day most he will be in. I suspect he will come back for his stuff. anyone have a good way to deal with this?