He died in December 1773, aged 62, and was succeeded in his titles by his son James.
He died 1780, when the 3rd Viscount Grimston, his daughter's husband, succeeded him here.
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Four of his uncles James, Edward, Robert and Francis Grimston all played first-class cricket, as did his cousin Walter Grimston.
Rev. Hon. Francis Sylvester Grimston (1822–1865), married Katherine Morier and had issue
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In 1802 Grimston was elected to the House of Commons for St Albans, a seat he held until 1808, when he succeeded his father as fourth Viscount Grimston and second Baron Verulam and entered the House of Lords.