Sherin Mathews mother has now been arrested but not in connection with her death. Richardson police said detectives learned that Sini and Wesley Mathews took their 4-year-old biological daughter to dinner and left their adopted 3-year-old daughter, Sherin, alone at home. According to an arrest warrant affidavit, detectives used cell phone records to show Wesley and Sini went to a North Garland restaurant on the evening of Oct. 6.