DSS seems to have finally decided that he has had enough - he didn't want to talk to his mum when she called, DP explained that it might be best until he sees the counsellor that she gives him some space, and she has gone loopy; threatening to turn up on the doorstep, withhold contact etc etc, and has demanded to speak to DSS so he can "tell her himself".
DP has spoken to DSS and he has said that he wants to tell his mum not to call when he's here (there is a HUGE back-story regarding phone calls to him here and DSS often goes several days at a time without seeing/speaking to her even when he is with her when he is left in grandmas care anyway).
DSS mum has been deluging the house with calls, and as one of those calls has been answered, I'm assuming that DSS is telling his mum that indeed, he would prefer her not to call 