Unwanted
Gregory’s step mother explained he had to stay with them because he was a burden on his mother – her financial situation didn’t allow for her to support three children anymore, and so Gregory was unwanted.
It now seems like his father and his new wife wanted Gregory to stay with them so that Gregory Senior would be relieved from his monthly duties of payments for his ex-girlfriend. One way or another, Gregory Junior was told there is no reason for him to return home and it was better for everyone if he stayed there.