Where did this weird kid come from?

I have this small male that lives in my house and I dont know where he came from. He is short and skinny, the size of a 2 year old.... yet he tells me he is 3 1/2 years old. He is cranky a real lot and yells when he doesnt get his way. Although I have noticed over time that the yelling has become a little less and he is becoming less cranky. He likes to play sports, usually in the house. He throws footballs, hits baseballs, and swings at golf balls; not to mention riding skateboards around the living room. I dont know where he came from because he doesnt look quite like anyone in the house. He hardly acts like anyone else in the house. And last time I checked I had a little baby boy... not this big kid in a little body. He is growing up fast and I cant believe how time flies. He makes us laugh with his quirkly little dances. He can drive any sane person to the brink of insanity and bring them back to loving him in just a moments time. He knows just the things to do to make you smile and melt your heart. He is one of the best at cuddling that I have ever met. So, I dont know where this strange kid came from, but I am thinking that I will keep him. He may be weird but he is an amazing little kid that fills my heart.