DP and I been together 10 months.
His DS who is 8 has always stayed with DP and DP's parents at their house which is where DP lived until 6 weeks ago when he moved in with me.
Last month DSS came to stay at my house to meet me and my DSes on his agreed contact weekend.
The plan was the same for this month but out of the blue DP's ex has texted saying she wants MY address or DSS will not be coming 
She says she has the right to know where her DS will be staying.
Can she insist on this?