Bert and Joe, both male and single, lived together as common law spouses and agreed to raise a son of Bert's living brother as their child without legally adopting him. Bert worked while Joe took care of their home and the boy. In their 20 years of cohabitation they were able to acquire real estate assets registered in their names as co-owners. Unfortunately, Bert died of cardiac arrest, leaving no will. Bert was survived by his biological siblings, Joe, and the boy. a) Can Article 147 on co-ownership apply to Bert and Joe, whereby all properties they acquired will be presumed to have been acquired by their joint industry and shall be owned by them in equal shares? (2%) b) What are the successional rights of the boy Bert and Joe raised as their son? (2%) c) If Bert and Joe had decided in the early years of their cohabitation to jointly adopt the boy, would they have been legally allowed to do so? Explain with legal basis. (3%)