How two sisters uncovered heartbreak in their grandfather’s envelope designs

When two sisters started researching their grandfather’s hobby, they uncovered a love affair that tore their family apart 100 years agoWhen Brenda Fitch was two, her paternal grandfather sent her a letter with a prediction. “I know,” he wrote, “that your dear Dada and Mamma are keeping a book of envelopes for you, and I have no doubt when you reach the age of 21 you will consider them interesting.”Frederick Tolhurst, Brenda’s grandfather, was an amateur artist