Nancy, I'm sorry to hear about your loss. It's tough. I lost my dad to cancer when I was in my thirties. For several months, I tried to keep him around still, by taking some of his old sweaters and wearing them, by buying some of his favorite gum (and I'm not a gum chewer!).
Losing a parent is hard, no matter what age you are when you do, but I would think it would be even tougher on younger kids, who are still living with their parents when one passes. That's why it really ticks me off when I see somebody like Tony Randall having a kid when he's 80, or Jerry Lewis (who doesn't look long for this world) having young children. And most recently, that women who is 70? having a child by artificial insemination. They're all setting up their kids to be 1/2 orphaned young.
Sorry about the sad topic.
When I did do father's day, it wasn't a big deal. Socks (maybe a few ties, but he rarely wore any, so they were mostly from when I was a kid), after shave, some bogus gift. A nice card. A nice meal. No biggie.