AIBU to be upset that family members thought it funny to frighten my son and film it?

[Mrsknowitall]

If you saw a video of your child running down the road hysterically crying and screaming and adults aged between 27-30 laughing, filming and screaming out RUUUUN (because they had been playing knock down ginger) how would you react? He thought he had people running after them.
me and dh was away for the weekend and left our children with my daughter (younger child 8 stayed with my parents) but then went to stay with dd on the Sunday, younger one is autistic and our ds 10 I suspect has something there too. It was my 10yo that was hysterical but they seemed to find it oh so funny to see him in such a state and I’ve now been made to feel like I have over reacted at seeing my child in distress after leaving them with family that I love and trust to look after him. There has been a massive fall out as my mum has tried to defend the adults and make excuses for them, they haven’t been told that it was out of order and you shouldn’t scare kids like that and I have had no apology at all, had they of taken accountability for it and said actually watching that video it does look really bad and I’m so sorry for upsetting him then I would be able to move on from it, but nothing, in fact my daughter sent me a message telling me I was out of order for arguing with my mum for defending them. My mum seems to think it will all blow over but without them seeing what they actually did wrong I don’t think I can move on from it. I trusted these people and they have completely broken that trust now. Have I overreacted? Is that something loving family members find amusing? To see a little boy so distressed and laugh and carry it on making it worse? Just to add it was my dd, dn and their partners. Sorry if I’m not making much sense I’ve hardly slept for 2 nights. We are a very close family so this fall out has hit me hard.

Not acceptable at all. Adults making fun of children, causing them distress and then choosing to film said distress, instead of comforting them is disgusting. When I am looking after children, I go out of my way to make sure they are safe and comfortable. What is wrong with people!

Jealousy could be a factor although your son should have been cared for and he clearly wasn’t.

You're in the 'right' with this. I'd go absolutely nuclear. They clearly aren't mature or responsible enough to look after children; I'd never in a million years humiliate my nephew like this.
They are most likely getting defensive as they know deep down they are in the wrong!

You are very wrong. The child was frightened, perhaps thought everyone was going to get into trouble. He was not overreacting at all. The blame and shameful behaviour lies with the adults who instead of caring for the child put him into a very stressful situation and filmed his distress. OP, you don’t need people like this in your life.

for one that was not a good thing to play; a lot of people would have been scared to get unexpected knocking on the door.
for your poor child to be scared out of their wits i would give them short shrift and would not leave my kids with them again

Cut contact and never leave him with them ever again. Evil little shits. How can they find this funny. If anyone is out order it is all of them. I would be fucking livid and ripping them all a new arsehole!