Rich is a widower who lives alone with Dave, an eight-year old foster-care child who has been living with Rich for seven years. Rich is the father of Lena and Bill, adult children he had with his now-deceased wife. Because of Dave's disabilities, the child-welfare agency that placed Dave with the Rich say that it is unlikely that anyone will adopt Dave. Rich tells the agency that he will soon adopt Dave. Rich has always told everyone that Dave is his son. He helps Dave with his homework and gives him chores around the house. Frequently, he takes Dave to family gatherings such as Thanksgiving, Christmas, and birthdays at the homes of Rich's brothers and sisters. Rich, however, dies before formally adopting Dave. Is Dave the adopted son of Rich? a. No, because Rich never finalized the adoption in court. b. Yes, because no one else was willing to adopt Dave. c. Yes, because of adoption by estoppel. d. No, because Rich did not have an opportunity interest in Dav