▁of ▁Benjamin ▁S ill iman ▁and ▁Har ri ett ▁Tr umb ull , ▁a ▁desc endant ▁of ▁Connecticut ▁Governor ▁Jonathan ▁Tr umb ull , ▁Jr . ▁In ▁addition ▁to ▁their ▁son , ▁William ▁Bur ke ▁Bel kn ap ' s ▁parents ▁had ▁four ▁daughters . ▁Bel kn ap ' s ▁sister s ▁were ▁Ele an or ▁S ill iman ▁Bel kn ap ▁Hum ph rey ▁( 1 8 7 6 - 1 9 6 4 ), ▁Alice ▁S ill iman ▁Bel kn ap ▁Haw kes ▁( 1 8 7 8 - 1 9 7 2 ), ▁Mary ▁Bel kn ap ▁Gray ▁( 1 8 8 1 - 1 9 7 4 ), ▁and ▁Christ ine ▁Bel kn ap ▁Robinson ▁( 1 8 9 0 - 1 9 1 9 ). ▁ ▁William ▁Bur ke ▁Bel kn ap ▁was ▁engaged ▁in ▁ 1 9 2 0 ▁to ▁Lucy ▁H ew itt , ▁grand d augh ter ▁of ▁Abr am ▁S . ▁H ew itt , ▁a ▁U . S . ▁Congress man ▁and ▁Mayor ▁of ▁New ▁York . ▁Lucy ▁was ▁also ▁a ▁great - grand d augh ter ▁of ▁Peter ▁Cooper , ▁a ▁merchant ▁and ▁phil anth rop ist . ▁But ▁a ▁date ▁was ▁not ▁set ▁and ▁she ▁wed ▁another . ▁ ▁William ▁Bur ke ▁Bel kn ap ▁was ▁married ▁on ▁September ▁ 1 4 , ▁ 1 9 2 2 , ▁to ▁Helen ▁Clark ▁Str ong . ▁In ▁ 1 9 3 4 ▁he ▁file d ▁for ▁divor ce ▁asking ▁for ▁cust ody