Thanks you @Dlee!
for updates, this sunday I have gone to mass with my son only (the other child was ill). I have gone to another parish where the church is bigger, to avoid conflict and have more space.
My priority was to focus to set limits to my children. He was not allowed to “speak” loud, to run, to walk without taking my hand. It worked. But I didn’t success in preventing him to overturn the kids’s chairs.
I treated him like a baby and I am not sure that he appreciated. It had to catch and contain him several times (more or less softly) and prevent him to hurt his head.
We sat on the floor on the back of the church where we can see or heard nothing. He was quiet for maybe 10 minutes. After, he was tired so he try to be active.
To conclude, I don’t annoyed anyone, but it’s a work in itself. I don’t think we both found that fulfilling on the moment.
I am afraid that mass will not turn to be a good experience for himself.