Jim and I - Gem and I

Jim and I are best of friends
Gem and I are twins
People say I have Jim's eyes
They say I have Gem's grin
Jim and I sail just for fun
Gem and I like boats
Jim knows every mast and boom
Gem only knows it floats
Jim and I like lightning storms
Gem and I've sailed two
Jim can steer through any gale
Gem's courage gets us through
Jim and I get lost sometimes
But Gem and I get through
I couldn't live without my Jim
I guess I like Gem, too