I feel old

Today is my nephew Owen's first birthday (though this pic is from the middle of Dec., so it's a little out of date). I feel...I dunno, old, maybe? It's not so much that I particularly am old, but now my sister has a kid who is a year old, and by the end of the further three years that we'll be here, could very well have another one, and by the end of those three years Joel and I could very well have one, and it's that which makes me feel old. I shouldn't be old enough that in three years my sister possibly has two kids and I possibly have one. Nope. Uh unh. I'm not that old! (This is almost weirder than my mom's 50th birthday two weeks ago.)

more logic humor

What is wrong with this inference?

"Brownie is yours, and Brownie is a donkey. Therefore, Brownie is your donkey."

"Brownie is yours, and Brownie is a father. Therefore, Brownie is your father."

The medievals sure seemed to like any example/problem that had as its conclusion "You are an ass."