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Male William Knapp Click to view William Knapp in the family tree

William was born on January 7th, 1901 in Grand Rapids, Michigan.1   William's father was Marinus "Martin" Antonie Knapp and his mother was Catharina "Kate" Kalkman.  His paternal grandfather was John Knop; his maternal grandparents were Kryn Kalkman and Maria Hoogendorp. He had five brothers and six sisters, named Marinus, Kryn, Richard, Richard, Cornelius, Marie, Johanna "Anna", Marie, Elizabeth "Betsie", Elizabeth "Bessie" and Kathryn. He had a half-brother and four half-sisters, named John, Cora, Nellie, Hilda and Infant.  He died at the age of 89 on August 3rd, 1990 in Vancouver, Washington.1 

Family Details of William's family with Henrietta Venhuizen

Family Details of William's family with Alice Rager

1 phelps.FTW
Further source/citation:
World Family Tree Vol. 22, Ed. 1 @ Tree #2589