My dad passed away in June of '04. It wasn't a big shock, I think we all saw it coming as he'd been in decline for some time. Thing is, though he and I didn't have a bad relationship, we didn't have a really close one either. We were cordial toward each other and never fought in our lives, but my dad was one of those kind of distant men. Didn't talk a lot, thus we never had the quintessential "father son" talks or watched ballgames together or went fishing, etc, etc.
Hence, even though I still feel great fondness for him, I rarely think of him. After he passed away, I just accepted it. Never cried or got depressed, etc. Recently, every once in a great while, he'll pop into one of my dreams momentarily.
I don't know if any of the above is a good or bad thing. I guess it's good in that I didn't have to go through all of that painful grieving, but not so great in that I would have liked to have had a better relationship with him.
At any rate, be happy for the life you had with your mom Ruthanne, and the memories you'll always have.
Just think of those who never had a mother to grieve for. You are one of the lucky ones.