My mom likes my big brother more then me..?

HOLY CRAP! Same thing happens with me, except it's when my brother teases me. Even though he's just messing around, my mom doesn't do much, but when I'm the one doing the teasing, she gets on my case in a flash: "Don't touch my baby!" "Leave my baby boy alone!" I'm 14 and my brother is 17. When stuff like this happens I just shake it off. Listening to my iPod and taking a little nap always helps, even though this doesn't really happen to me anymore. I'm guessing the reason why your mom is so gentle on your brother is because he's her first child.