Nine
Arthur Weasley stopped speaking. Having had to bury his own son turned the once happy and talkative, muggle-obsessed man into a quiet and solemn presence. He turned cold to the world.
Eight
Molly Weasley cried herself to sleep. Every night. Her hair turned gray and she stopped caring about her appearance. Without Fred, life was much calmer. But she hated it. There was nothing to make her smile.
Seven
For Bill, the Burrow held memories of pranks, explosions, and hectic moments. Without these, the Burrow felt empty. It hurt him too much to visit, so one year, he just stopped. He hasn't seen his family in years.
Six
Charlie simply stopped caring. So when a dragon had bitten him, he didn't go to St. Mungo's. Instead, he let the blood flow out of his body and let the poison take over.
Five
Percy found that drinking was the only way to heal his pain. He blamed himself for the death of his brother, and wasn't even able to kill the Death Eater who gave the final blow. So he turned to several bottles of firewhiskey a night.
Four
George had lost half of himself when his twin died. He broke all mirrors in the house and often stayed locked up in his room for days at a time. He felt alone and helpless, and was constantly suffering. He started seeing hallucinations and eventually went mad. He never laughed again.
Three
Ron knew he couldn't patch up his family, and watching them fall apart hurt him. He tried to help, but failed. He busied himself with work as an auror, so he wouldn't have time to feel.
Two
Ginny took care of her dying family. She gave up her career and life, and nursed each one till they died. After many years of hurting, she too died, quiet and alone.
One
Fred watched, but couldn't do anything about it. He killed his family.