My dad was at all of my kids' soccer games (shared passion; former coach) and he used to always give them a dollar when they scored a goal. I loved sharing the sidelines with him because he was hilarious.
The first game my youngest played in after my dad died, I was so sad. I missed waiting for him to walk up with his soccer chair. It was hard to see the other grandparents on the sidelines.
Well- my son scored a pretty amazing goal. We were in a different town and pulled into a Starbucks. When my son opened the door to step out, there was a $1 dollar bill on the ground by his feet

.
There were a lot of very strong signs the months after he passed. I remember driving down 66 and our car was literally swarmed by dragon flies. There were certain songs we loved that would come on when I was in a low point. There were so many different things that could not be 'mere coincidences'.
My dad also was one that told us he would send us signs.
I don't get the posters bashing others. If this gives someone comfort, let them have it. Calling them delusional and names is just plain ugly.