According to a record maintained by the Reverend Theophilus Cotton of Hampton Falls, NH -

Thomas Richardson of Newbury married married Hannah Pottle of Hampton on August 31, 1719.

Daniel Richardson married first Sarah Pottle on February 5, 1723. She was the mother of all his known children according to Newbury VR's..

The marriage records are reproduced in History of Hampton Falls, NH, 1640-1900, by Warren Brown, Manchester NH, John B. Clark Co. 1900.

The Pottle girls were daughters of Christopher and Hannah Pottle, who lived on the Falls side of town from about 1695, according to Joseph Dow, History of the Town of Hampton, V2 p. 614, Salem 1893. Christopher Pottle, a tanner, and Hannah Graves had been married in Ipswich, MA on March 12, 1693-4 (Ipswich 2, 358). Christopher Pottle died before the baptism of his son Samuel..

This may be the same Samuel Pottle who married Hannah Bodwell on November 21, 1734 in Methuen (p255).

Daniel Richardson married second Lydia Mireck, née Brown, widow of Joseph Mireck, on 27 July 1761. He "take said Lydia naked, viz without any of her husband's Estate." (Newbury 2:330).
Lydia was the daughter of Thomas and Elizabeth Brown, born 21 April 1715 (Newbury 1:69). They were second cousins, their common great grandfather being Thomas Browne, one of the first settlers of Newbury.