Maus is a good choice. I gave it once to my parents to read and they both liked it.
I also try to give Tezuka stuff as presents whenever I can. For example, I gave the French Black Jack vol 1-5 (for christmas and birthday XD) to a friend who wanted to train his French. He knows all about manga and comics but rarely reads them. But I'm happy to say he really enjoyed Black Jack. ^-^