I'm so very sorry. My grandmother passed 2ish weeks ago, I've never seen my father cry and he sobbed on my shoulder. I can only imagine how hard it is to lose a parent.
I'm so sorry, that's a lot to deal with. I'm glad you were able to keep yourself busy for a while. H doesn't have anymore living grandparents and I know at times, especially big milestones, he gets upset that they couldn't share that with them. I'm so sorry and sending ((hugs)).