Peter
It would appear that Richard LAND did marry Elizabeth HUNT in 1761. In his will dated 4 July 1789 (proved 19 March 1790) he names his wife as Elizabeth. He also names sons Richard, John and William and daughters Joan LAND, Martha LAND and Kitty ADKINS. [Oxfordshire Record Office Ref: 217.261]
He seems to have had at least four children by his first wife Elizabeth ROBBINS who he married in 1743. These were Anne, Elizabeth, Kitty and William who were all named as grandchildren of William ROBINS farrier of Middleton Stoney, late of Bucknell, in his will dated 31 August 1750. All the children were described as minors, i.e. under 21 years of age [Oxfordshire Record Office Ref: 213.433]
Richard LAND appears to be the son of Richard LAND and Ann KNIGHT who married in Middleton Stoney in December 1710. This Richard also left a will dated 10 April 1742 in which he named his wife Ann and his three children - Richard, Katherine PYBUS and Elizabeth BOTTRELL [Oxfordshire Record Office Ref: 211.38]
Finally, Richard LAND is also mentioned as the brother in law of William PYBUS, gentleman of Hethe, in his will dated 11 August 1789. This William also names his sister in law as Elizabeth BOTTERELL [Oxfordshire Record Office Ref: 100.188]
To tie it all up together you really need the parish register entries from Middleton Stoney. Perhaps another Rootschatter can help you there.
Orpheus