Mother, and 2 sister-in-laws = Boogie Boards - digital blackboards (http://www.amazon.com/gp/aw/d/B002ZE4TDI)

2 brothers = blow guns (http://www.amazon.com/gp/aw/d/B003NEVP36)

No idea what to get dad *got Dad (who's a motorcycle enthusiast) a portable electric tire pump he can carry in the side case for emergencies. Plugs into any car lighter socket. (http://www.amazon.com/gp/aw/d/B000GC9B0W)

or my little nieces yet... I'll be looking at the other replies for ideas!

Great thread by the way.

Those sound like cool ideas! I'll just throw down some good go-to guy ideas that I've had awesome success with before.

Blowgun this will turn any aged man into a child again.

Das Horn is awesome cuz hey, who doesn't want to feel like a viking.

These beer openers are so cool. Got one for my dad several holidays ago, he loves it.

Hopefully helped a bit! I know nothing about knife sharpeners either, but if he needs one that's a good idea!