Robin Valentine with son, Alexander, and daughter Alanna. There is joy in owning one’s first home. But homeownership has a deeper meaning for Robin Valentine. Unlike her late mother, who was unable to leave any money to her children, Valentine will one day pass on the house that she purchased last September to her three children. “I told my children, ‘If anything happens to me, and you don’t want to stay here, that’s fine. Take the money [from selling the house] and put it towards your home,’ ” she said. “It’s more than just me buying this house and living in it. It’s for me to leave a legacy.” Valentine, who is 52, is accomplishing something that historically has proved…