Same stomach virus affects people differently?

Yes it is possible for a virus to affect people differently. This happened to my family this past Christmas. Almost everyone got it. My sister, cousin, and my mom ended up throwing up, whereas my aunt and my dad got diarrhea. Luckily I didn't get it though. Make sure everyone says hydrated. Gatorade is really good, and pedialite is good for small children. Oh, and don't take the docs word that it was just a sinus infection. Obviously it wasn't, so if anyone doesn't feel better within a few days it would be best to go see the doc again, perhaps even another one.