Robert Seyffert is determined to revive the reputation of his grandfather, Leopold Gould Seyffert, a portrait painter whose career began in the early 1900s when a Pittsburgh oil man became his benefactor. After retrieving 10 of his grandfather's paintings from a Connecticut storage locker in 2010, the 61-year-old sold some of them, including a finished portrait and two unfinished studies of Howard Covode Heinz, the second son of ketchup company founder H.J. Heinz.