Ha haa, your snowball fights in July are a classic. I'm sure you had the original ammo. It's darn hard to make a projectile out of freezer mange. I've tried. (Doesn't taste too good in a cold drink either, when you can't find any ice in the chest freezer).
I remember all those sibling shenanigans well. Many is the time we ran my sister's Barbie car down the drive with my little rubbery Troll-Ogre guy driving, and Barbie screaming in the back seat, as it careened over the curb and crashed in the street beyond. Amazing my sister still talks to me. I guess we either forget these things, or realize we're now (sort of) grown up. Luckily she never realized those dolls were an excellent club, they definitely would HURT.