While I agree that the family would have taken it hard, I think Arthur's death would have brought Bill and Charlie back home, so they could help out. I think Bill would have assumed the role of the head of the family, thus being able to veto some of Molly's decisions. I think Bill was able to see that while his brothers and sister were young, they would have fought in the war anyway and Bill would have pushed Molly to allow them to train and prepare for it. Also, I think Arthur's death would have pushed Percy away from the family, instead of closer to it. He'd probably try to make a new reputation for the Weasley name.

Lena/Gryffindor/6