Math

• http://xkcd.com/263/
• http://xkcd.com/55/
• http://xkcd.com/26/

For my Brother

• http://xkcd.com/32/

For my Sister

• http://xkcd.com/42/
• http://xkcd.com/57/
• http://xkcd.com/101/

For Me

• http://xkcd.com/52/
• http://xkcd.com/59/
• http://xkcd.com/85/
• http://xkcd.com/96/