Lama Ole’s answer:
You should try to get over the grief as soon as possible, because while grieving you simply don’t have any surplus. Instead of grieving for people who are dead, you could do a few good things in their name.
Do it like the old Germanic peoples: they get together three days after the death and drink a fair amount to the noble exploits of the one who has died. In this way, they let go of the dead.
When my parents died, I could help them get to the pure lands, where they are protected and doing well. My experience with this is that I still feel them, that they are there and doing good things. Let go of the grief; it doesn’t benefit anybody.