XII. Ernesto, an overseas Filipino worker, was coming home to the Philippines after working for so many years in the Middle East. He had saved P100.000 in his saving account in Manila which intended to use to start a business in his home country. On his flight home, Ernesto had a fatal heart attack. He left behind his widowed mother, his common-law wife and their twins sons. He left no will, no debts, no other relatives and no other properties except the money in his saving account. Who are the heirs entitled to inherint from him and how much should each receive?(3%)