Hi Delilah and welcome....I think many moons ago we had a similar thread about grandmas having to step into grandads shoes, due to either grandad being poorly or him not being here at all either through death or separation.
My GS granddad died 11 mnths ago and he does miss grandad, but grandad was poorly from day one of GS life, he seem to accept that, so he sort of grew up knowing grandad couldn't run around play football.games etc with him, so Grandma had to step in grandma is an expert at Lego building, ball batting, mending bikes chains, helping with homework, (haven't quite mastered the football rules yet, and I really don't fancy fishing)!
We did used to have days out at the seaside and grandad would sit in the car or the odd time when he had his mobility scooter out, GS would be allowed to stand on the front.
I can understand your anguish, unfortunately we don't have a big family, no uncles about to sort of take over the role, but it's just something we have had to get used to, GS has his dad's side of the family where there are a few more males about, so at least GS has that when he is over that way.We have always made sure GS has chance of any activities, football, tag rugby,and to make sure he does the normal things that boys do. Hopw you enjoy Gnet and look forward to your posts