No way, Hank's not one of the transX-Men.
His mutation, like Warren's, is all about being a representation of nature.
That, and having LARGE HANDS ... *hint* *hint*
Besides, there are at least two possible candidates for the mom, both of whom would be super-awkward.
And let's not forget young "Uncle Hank" and the fucked dynamics of that family structure.
It's all good just as is.