THE SINGLE BEST STRATEGY TO USE FOR EXTRAJUDICIAL SETTLEMENT WITH DEED OF SALE

My mother has handed past 12 months and my father remains to be with us but really wants to sell a house that is certainly beneath both of those my mothers and fathers names, but they are not thought of lawfully married as my mother will be the 2nd wife as there isn't a divorce while in the Philippines. How are we to divide the divide the assets be