Hi MuumaB,
I have a 7 year old daughter in grade 1. She is acedemically well beyond her years, she participates in extra curicular activities, acedemic programes run outside of school and believe it or not - she goes to a public primary school. Sending your child to a private school does not make them smarter or nicer. If they are going to do well they will at public or private.
I would love to send DD to a private secondary school, but I think that's for me. I have friends who went to the local high school and one of them is a federal policeman, and 2 are lawyers. I also have friends that went to a private catholic school and while some went off to have wonderful careers - 1 of them is working at a supermarket and another is a manager at McDonalds.
Primary school doesn't matter so much as they focus socialising rather than training them to be surgeons. I think you would be better of sending your DS to the local school so he can make friends in his area, you can enjoy walking to school and you will be close by if ever you want to be a classroom helper. Weigh up the pros and cons - at the end of the day he is YOUR son - not your parents or inlaws.