Will I be in trouble if I immigrate?

Try citizenship by investment

Politically Correct, you can't just sit down and talk with an abuser. If you do that, the abuser might try to kill you.

The Canadian government isn't known to torture people. But whether your custody documents would stand up to legal scrutiny would depend on what you mean by "trick". Then there's also the question of whether you even qualify to immigrate to Canada. Canada isn't the US and you can't just "migrate" there like a bird crosses international borders. 

Unless you already are both Canadian citizens and already have a Canadian passport for you kid, you are not migrating there ( or nowhere else)... when you get divorced when there are children from the marriage all that is dealt with at the same time as the divorce, so you will be 'tricking' no one

There's a mountain of paperwork involved when it comes to immigration of a minor to another country. Your abusive spouse would have to sign at the Canadian consulate the paperwork allowing you to take "his" child out of "his country. I can't imagine a situation where this is going to work.

Unless you and your son both have Canadian passports you are not moving there.  You are going to have to deal with this situation like an adult.  Children run away and hide, adults solve problems.  Sit down and talk to him.  If you hate his family, talk to him about moving elsewhere.

Canada will not go along with you doing this.