Titania, I understand the feeling of being "replaced" in this context.
I had to some extent a similar situation with my grandfather on my mothers side of the family.
My grandmother on my mothers side of the family had died several years before I was born. So I never knew her.
My grandfather on my mothers side died in March of last year, due to a rejection of his newly transplanted heart, which he had recieved about a year earlier.
I never really knew my grandfather on my mothers side, because my entire life I have lived 3-6 hours away from him. Seeing as we aren't the richest family on the block, we only traveled to see the grandparents on both sides of my family on the big holidays, Christmas, and sometimes Thanksgiving.
I don't have any "joyous and precious" memories with my grandfather on my mothers side. His step-grandkids have that.
To keep this relatively short, when we got to the hotel the night of the funeral, I didn't cry until I knew everyone else was asleep, and it was merely tears. Not tears of sadness, but anger. I felt that something had been stolen from me. I had hoped to spend more time with my grandfather on my mothers side. Didn't happen. I later realized that the step-grandkids needed him much more than I did.
The step-grandkids (two of them) had some pretty bad parents. Their parents often would leave them at my grandparents house early in the morning (5am-7am) on Friday, and simply leave a note, "we don't want to see our kid until Monday when they get home from school."
There were many many things I consider to be deplorable that happened to that degree.
I think god does things like this, to get our attention. About 8 months ago or so, I realized I needed to spend some good quality time with my grandparents on my fathers side. Theres another story with that group.
I had asked my mother if I could spend a week or two this summer staying with my grandparents on my fathers side, she liked the idea, but didn't want me to go around harvest time. Which was when I wanted to go. About two weeks ago, my mother started talking about taking my brothers out there and we would all spend a week visiting and spending time with family and friends from the area. I was a bit unhappy about this, as I had planned to talk about some things with my grandparents without having my parents there.
I am sure god has planned it this way for a reason. I will only know when it happens.