I have two questions.

The first is simply, why do I have to wait until my grandfather has been dead a year to do his temple work?

The second is a bit more complicated. My grandfather was married to my grandmother for less than five years. They had three daughters and then divorced (the timeline on that is a little shady). He then married my step-grandma and had my uncle. What I want to know is, is there any way that my mother (who is a member) can be sealed to her parents? We have done my grandmother's work already. But I didn't know if the fact that they divorced has any bearing.