Salamu alaikum wa rahmahtullahi wa barakatuh brother,
I am in the same situation as you right now, however my parents are only aware of my interest in Islam. They still don't know I've reverted. The simple fact is that this is a test, so treat it accordingly. The last thing you want to do is give up hope.
Make lots of du'a and pray that inshaAllah Allah [swt] guides them to the straight path.

Good luck.