It's possible for deceased to give a sign to his/her love one through dream?

Question

maybe tell them about a bad omen

Answer 1

I would assume so. I mean if ghost can manifest themselves it would be easy for them to get into ones dreams.

Though if he/she is in the dream I don't know how they could also be in heaven. I think they would be in purgatory. See what I'm saying?

But to answer your original question (once again): yes.