wtf

I could have sworn I read about what happened to the kid.. was is another manga?? Help please - it was set about 70 years in the future, two children (early 20s looking?/vamp kids) and the father were visiting their mother's.... grave. Older boy said something like - maybe this time I'll go to uni, younger girl said she'll go with him (instead of repeating high school again).
I'm so confused...