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Since she is probably trying to get more than half due to his infidelity with you, he may want to start reporting her physical abuse (hitting, throwing things if they hit him) to the police so that he can defend against her infidelity charges with spousal abuse charges.
What it will take for the two of you to be under one roof is for the man to report the domestic violence,and file for a restraining order against her (it may be called something else in Canada), and to build a case against her so that the property will be split 50/50 by the courts. He should consult an attorney at once.