My son was 3 going on 4 when my wife realized she didn’t want him going anymore. I was already out about a year and she was early on in her fade. My MIL who lived down the street wanted to take him in service and meetings when Mrs Dazed couldn’t make it. We told her (MIL) that I didn’t want him attending the meetings anymore. She didn’t put up a fuss, at least not to me.
Even at that young age, he kept saying that he wanted to go to the meetings. He continued to ask to see 2 of his friends for several months from the hall. We would make up reasons why we couldn’t see them anymore. Eventually he stopped asking after making new friends with several of our neighbors. My wife stopped all together a couple months after my son turned 4.
My daughter was not even 1 when this all happened.
I can imagine, based on how smart he is, if he was allowed to continue past the age of 5 it would have gotten much harder. I would recommend getting to know your neighbors with kids his age or kids from his school and allowing him to hang out as much as possible with NON JWs. Going to birthdays ect. The quicker he starts breaking free the quicker he will forget the brainwashing. he's a bright boy. He understands a lot of the JW doctrine already.
Good luck and welcome.