Brothers

I drew this a month ago(?) just a doodle with water colors for my sister, she requested me to draw her manself, Sam(black hair) with mine, Math(yes his name its Math). Just a fact, actually Im older(just for 2 years) and taller that my sister, but as my manself is small (I just wanted him to be short,grumpy and tsundere, well my friends tell me Im the same XDD except for short) and her manself its really tall(she liked that way) things get opposite XD