Fighting back After Mark and Jenny Mosier lost their 6-year-old son, Michael, to a rare form of brain cancer, the Bethesda couple committed to doing whatever it takes to keep other families from suffering the way they have By Mike Unger | February 8, 2021 Photo by Lisa Helfert The party was, by all accounts, a blast. Kids plunged into foam pits. Moms jumped on trampolines. Dads played dodgeball. Pizza was the main course; for dessert, almost everyone devoured a slice of the baseball-themed cake. The birthday boy, Michael Mosier, preferred his Grandma Nancy’s chocolate chip cookies, but h...