Is my wife entitled to my inheritance, or can I give the money back to my mom or family member?

No, your wife is not entitled to any inheritance you have received directly from your mom during your marriage.  Under the Ontario Family Law Act, certain things will be automatically excluded from your list of assets that are subject to division and equalization, if you and your wife divorce.  Inheritances received during marriage are among them, and its value is calculated as of the date of separation.  You don’t need to go to the trouble of returning the inheritance or transferring to another family member (under a trust, for example).