Here is the end, hope that it ties those final knots for all of you
Christopher Perry Halliwell led the Resistance for 6 years before going to the past and saving the world so that none of this would ever happen. As he stepped through the portal watching his fiancée fight he heard the grandfather clock chime midnight, as he stepped into the past it chimed one more time making 13 and fulfilling the prophecy. He defeated the evil after his brother, and his soul, and unfortunately all the memories that it contained, was given to the new baby version of himself. He and Harry had that drink when they were 24, they toasted James Sirius Potter and the new generation that he represented. Harry didn't know who he was, but had a feeling that he couldn't explain. He works with his mother in the restaurant and the nightclub.
Melinda Penelope Halliwell never fully recovered from her confinement, but was able to lead the Resistance after her brother left. She made sure that Bianca had a funeral and got the truth out that she was never the traitor they thought she was. She had an ongoing relationship with Griffin Parks Black, they were one of the few success stories during the war. In the changed future, Mel met and married a Griffin Parks. They met at Magic School and were never parted after.
Hope Peterson was killed by Sterling Bates when they were both 19. Sterling turned sides and joined the society of Wormtails after Wyatt promised him great power. Hope was Chris's best friend in both futures and they were married in the changed future after Chris finally stopped running away from his feelings and the nightmares that always plagued him. Their first daughter's name was Virginia, they called her Ginny.
Griffin Parks Black was crushed when the news of his father's death reached America 6 months after his death. He threw himself into the Resistance with a vengeance. Only Mel was able to talk to him and relate to him what it felt like to lose a parent. In the changed future he never met his father and his mother refused to discuss it. But he did feel a strange compulsion to give his first son the middle name Sirius to the anger of his mother.
Elder Leo Wyatt was never talked to by his children. Wyatt even refused to speak to him, and Chris and Mel had already made their feelings known. He died when Chris was 21 after a darklighter sent to kill Chris, hit him after he threw himself in the path of the arrow. Chris never knew that it was his father who had taken the arrow for him.
Harry James Potter found out that the war in America was finally over when the first tourists showed back up in England when he was 23. It was then that he discovered that Chris had been fighting his brother. And you all know what else Harry did.
Wyatt Matthew Halliwell was completely angered by the fact that his little brother betrayed him. However, he gave both his siblings chances to escape from him, even when he had them surrounded. In the changed future he became a school guidance counselor and preached a nonviolent solution to everything. He is a terrible cook.