A few months before he died my Dad called me on my birthday and said something about me turning 40 and then he said, "Happy Birthday, honey"-- after a lifetime of no parties, presents, anything! I was absolutely shocked but very very happy to hear him say those words.
I can't give my Mom a birthday present on her day but many years ago I started a "tradition" of giving her a gift on MY birthday. I tell her it is my thanks to her for giving me life. She is always so touched and she seems to really look forward to it. (She usually takes me out to dinner later that night and then she has to worry that one of the dubs in our town will see her out with me)
My parents never shunned me the way so many do--I was lucky in that regard. Once my Dad took me aside though and told me that I could come over to his house to eat anytime I wanted, but if Mom was sitting at the table could I please take my plate to the couch or something--so strange.