After the English Civil War, Reresby in 1654 went abroad, where he became a friend of Henrietta Maria, the widow of Charles I, whom he visited in France.
After his return to England, Reresby married Frances, elder daughter of William Browne of York, barrister-at-law, on 9 March 1665.
Legal differences with the family of the Duke of Norfolk may have lain behind a false accusation made against Reresby: that he had caused his black servant to be gelded "and that the operation had killed him" on 20 October 1676.
[1] In 1678, he spoke in favour of giving aid to the king, and the following month obtained a commission for raising an independent company of foot, and was appointed governor of Bridlington.
In November following he was made a justice of the peace for Middlesex and Westminster, and in that capacity superintended the prosecution of Thomas Thynne's murderers in February 1682.
Though he promised the King to stand for York at the next general election, Reresby had for some time past been growing lukewarm in the royal cause.
Leonard, the youngest son, born in 1679, succeeded his brother William as the fourth baronet, and died unmarried in 1748, when the baronetcy became extinct.