Ai cant imagine a loving father banishing, even the worst of sons, to hell forever.
And Ai cant imagine a by-the-book father retaining, even the best of sons, in heaven forever (Why then, put us here in the first place

).
If either(hell/heaven) were eternal, I will be quite surprised.
Tho' the idea of, transient, visits to those places does make sense to me.
So my final answer is- Heaven & Hell ? Yes. Are they forever ? Cant be.
N.B: I like my answers(belief)very much, so please dont try to prove me wrong.