Each person has their own situation so it isn't my place to give specific advice, but each and everyone should pause for a moment on this day, be thankful that they are alive, and consider to do the right thing that they wouldn't regret if they don't do it. Even if you wouldn't call your parents.
I think owing something should be contractual - they consent to owe something in a fair exchange.
A person does not consent to being born.
If someone treats you properly (raises you at least somewhat decently), you don't owe them anything, but you should feel an obligation to thank that person whether it's by saying thank you, or helping them later in their life when they need help.
I think my parents were good parents. I like them. They were good parents who really wanted to take care of kids, and were active in mine and my sisters' lives.
My wife's dad ran away when she was fifteen (and with two considerably younger siblings), without any attempt to contact them or pay child support. He's a douche, and I do not blame my wife at all for having no desire to take care of him when he's old.
Her mom is very cool, and took care of four kids on a low income while still being active in all their lives. My wife will probably take care of her if she's unable to take care of herself.
People like to act that if you share DNA with people you have to grovel to them. I think that's dumb.
Each person has their own situation so it isn't my place to give specific advice, but each and everyone should pause for a moment on this day, be thankful that they are alive, and consider to do the right thing that they wouldn't regret if they don't do it. Even if you wouldn't call your parents.