1. The Will appears to be defective since if your mother becomes owner of the property after the death of your father, your father can not further express his will that after the death of your mother, you will get the property,
2. It may be that your father has given your mother living right for her life and after her demise the property will be bequathed by you,
3. If your mother has living right only, then she can not deal with the property in any way,
4. If the property has been bequeathed to your mother then she is the absolute owner of it and you can not lay any claim on it.