DP ex stops him seeing his son

[stressedcatt]

Hello, hopefully this won't be long but we are in dire need of some advice.
My DP has a 4yr old son who he hasn't managed to see for over a year.
We've been to a solicitor but there wasn't much help they could provide. Ex has moved house, changed number, blocked us on FB, don't have any contact details for other family members. What on earth are we supposed to do?? He's painfully aware this could be the 2nd Christmas without seeing his boy. He could be dead and we wouldn't know?! What can we do wise MN!

I honestly did say that I was sorry for asking her such questions but if there was any chance he so much as harmed a hare on her head I'd like even for her to just nod and I'd have been running for the hills but all she said was no,
I said DP would love to see DS and she just looked right through me. Didn't say anything until I said that he has presents for him