In my son's transition from one school to another, his relationship with his Dad has deteriorated. 
My son refused to go to his home, see him or talk to him.  When forced, he engaged in fight or flight, refused to eat, yelled and refused to come out of his room at his dads. 
Dad has allowed him to stay with me for the last three weeks, hoping that giving him time would help. I am at a loss how to help them with this relationship or at least get my son to the table. Please help!  I'll pass on the tips. Thank you!