My mom is a multi-faceted genius. It is extremely difficult to find something which she can't handle. She did a Masters in English Literature and yet coached me in mathematics till I left home for IIT Kharagpur. Most of the math that I know of I learned from her (okay okay except some discrete math that I learned in college). And to cap it all she is a terrific cook.
My sister Swaha has just started grad school in the CS department at UNC. She is a techie with the heart of a poet. Quite a few of her contributions has been published in Alankar, the student magazine of IIT Kharagpur when she was a student there. She helps me out a lot by advising me on anything and everything under the sun. I just adore her.