What is causing my gum recession?

I've gotten opinions from 2 dentists. 1 believes it's a result of my edge to edge bite while another believes it's because of my tongue thrust problem. I'm 23 and have significant gum recession for my age. I'm currently working with a speech therapist on fixing my tongue problem, but I'd like a third opinion on this. If it were because of my edge to edge bite, I'd be looking at a $4000 Invisalign treatment. NOTE: My brother has also had gum recession problems so it's likely in my genes as well.