I’m sorry to tell you this, but when we die, that’s it. The joy, pain, and everything in between is over. The best thing you can do for your parents is remember them. That way, they live on in you. That way, what they did can still affect the world through you. Cherish your memories. And most of all, if you can, and still have a good relationship with the family you have now, cherish and enjoy them while you can, because we only get this one life. Especially if you still have a good relationship with them. Trust me. This comes from someone who is having severe family problems and may be disowned by the majority of my family, though I don’t know for sure.
I wish you the best.