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Has this abuse been reported at all?
If you have to leave the home for safety reasons then you can leave with your child. If there is abuse this could be grounds for leaving.
You could call the police or child protection services.
Otherwise it could be considered to be parental abduction if you leave without an agreement or court order.
It seems to me that your best next step is to consult with a family lawyer face to face and before doing anything else.
In most provinces you can contact the Law Society and use their Lawyer Referral Service. You will be given the name of a lawyer and can consult with the lawyer and the first half hour will be free.