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Who contributed to the acquisition of the home?
Who has been paying the mortgage payments?
In Ontario common law spouses do not have property rights. That means that the presumption is that whomever is on title owns the property.
But that presumption can be rebutted if the other spouse has contributed to the value of the property.
So if your spouse paid some of the mortgage payments and this was above fair market rent as she is living free in your house, then she would be entitled to an interest in the property. If she did not then she would not be entitled to any interest in the property.
So if the mortgage payments can be said to be in lieu of rent then you would own 99% and her mother 1% in most cases.
She would not have to pay rent if she was not living there so if that is the case the mortgage payments would count as a contribution to the value of the property.
The court would look at all contributions and compare them to decide what is fair in terms of interests in the property.