Replying to Xmas morning, stockings

me and my bro are opening our stockings, and i get 3/4 of the way down and open this book about the birth signs (virgo etc..) and its like june 22- july 22, and my b day is sep 11, and my bros is july 3, and i was like mom did you mix these up and she goes "oh shit your doing each others stocking" and my bro was like "yeah, why did i get razor baldes :S" ahaha it was funny.. so we switched seats and opened the last bit of each other stockings wich really ended up being our own stuff.. who thought santa would mix it up?