Knatchbull married Alice Wyndham, daughter of Colonel John Wyndham and sister of Thomas Wyndham, 1st Baron Wyndham before 1698. They had eight children, three daughters and five sons.
Knatchbull wed Alice Wyndham, daughter of Colonel John Wyndham and sister of Thomas Wyndham, 1st Baron Wyndham before 1698. They had eight offspring, three daughters and five sons.