I think my Nan probably did have a sense of humour as her 2 children certainly do. She was a very loving woman who welcomed people and baked for them and I do remember her telling me when I was younger that if she could come back to let me know, she would do something that wouldn't scare me.
WOW that you once asked for a sign and then got it. That sounds like proof to me, especially because as you said it was impossible to do.
That's amazing also that your son saw a ball of light but it was a shame you couldn't see it also. Maybe you weren't meant to for some reason, maybe he was the only one who was meant to see it. It's wonderful knowing that someone else has seen similar though
I wonder if my partner was in the room if he would have seen it...probably not!
Another experience was felt by my partner at my Nan's funeral. When I was crying my heart out (as you do) my partner felt a stone cold spot above my shoulder which stayed there for a short while. It brought us comfort that my Nan might have been trying to comfort me. That also reminds me of my partner's Dad. He saw his brother at his own funeral.
A few months back, I can't remember if it was this year or last year but have written it down somewhere, I asked for proof of heaven before I went to bed. I asked for a white feather. That didn't happen but I woke up in the middle of the night to a woman standing by the side of the bed. I got a motherly impression from her and at first I thought it was my Mum but then I thought it was my Nan. There was a big frame in the room kind of thing and she stepped in to it and I saw her facing sideways. Maybe she did that once I realised she was there, so as not to scare me. I also felt someone sit on the bed at the same time. She was there for a bit and where this vision was, the room was lit up a bit lighter too. Then it all faded away and I reached out to my bedside cabinet to grab a cup of tea but there wasn't one there. For some reason I thought I had been left a cup of tea lol. My Nan LOVED her cups of tea!!
Another experience was many years ago a relative would always come for boxing day. She passed away many many years ago and one boxing day when I was out in the garden, I smelt her perfume. I just knew she was there because of what day it was. No one believed me though, they all said it was perfume that would have been carried by the breeze. I don't think it came in on any breeze though because the air was very still that day, no breeze whatsoever and the only time I had ever and have ever smelt that lovely perfume was when we were in the company of my relative. I know in my heart that she came for boxing day in spirit.
Another thing happened the other Christmas. My Nan (Mum's Mum) always came at Christmas but a few years after she passed away, my dog was looking up at the corner of the room and going mad. He had definitely seen something judging by his excited behaviour. I got my camera out ready to take a photo and just as I looked through the screen, a little white orb floated by. But by the time I had taken the photo, the orb had gone so I didn't catch anything via camera. I have never seen anything like that before though so I think it was bizarre that my dog saw something and at the same time I saw something.