Making a Bears fan

My grandpa came over with a football for Wes. This is funny because I come from a very un-sporty family, but all of a sudden they are all very excited about this new boy in our family and with that is all sports stuff!
I already bought Wes his first Cubs outfit to wear next spring. We like the Cubs, the rest of my family are all Sox fans but the Sox outfit at the store was more expensive :) I wonder why??