Wedding Gifts For Parents??

Im a little confused on this .. My friend was telling me i had to buy gifts for the parents, even though im the one getting married. Is this true?? my parents arent the ones giving me way in my wedding, there names arent even on the invitations, my fiancee and i are the ones paying for are wedding. ...well, his mom wanted to help also and she is paying for are cake.
If so, what kinda things are good to get??
I seen these hankies that say "mother of the groom? and mother of the bride" do you think this would be nice?? since im already on a tight buget?
Thanks for your inputs..=0)