DeathB4DNF

Step 1: File for Fraud Alert.

This should temporarily stop any other accounts from opening or make it difficult. This lasts for 90 days.

Step 2: File a police report

Having a police report will allow you to have an Extended Fraud Alert and lasts for 7 years.

Step 3: Go to lawyer or local Bar association to find out next course of action (as /u/Elledan suggested).

Hopefully, there will be a lawyer or firm willing to take your case pro-bono or at reduced rate.

IMHO your family screwed you over. Family really shouldn't do this; I wouldn't consider them family anymore and I would essentially consider them like any other identity thief and wish them ill will. You're probably a better person than I, I wish you the best of luck.

TL;DR- goto police and get lawyer (or local bar association, as /u/Elledan suggested)

Edit: to reference /u/Elledan

In the immortal words of Philip J. Fry: [gasping] Why couldn't she be the other type of mermaid, with the fish part on top and the lady part on the bottom?

I just checked and just 2 hours into this AmA, he's only had 10 responses to questions.

I think he's not answering any questions anymore.

In the DC area, thanks. If I ever run into you, I'll buy you a beer.

Sounds like you went to one of the senior military colleges.