I am not researching any of these families, but have a booklet with some information.The "Historical Atlas of Westmoreland County, Virginia" by David Eaton, 1942:
"Augustine Washington, born in 1720 was the third son of Augustine Washington and his first wife Jane Butler, and was called 'Austin' to distinguish him from his father.He married Ann Aylett, daughter of William and Ann (Ashton) Aylett.He inherited the large Wakefield estate from his father, some 3,000 acres, while his elder brother inherited the Mt. Vernon estate.Both these sons had been educated in England.George Washington spent three winters in school living with his half-brother Augustine and his wife Ann Aylett Washington.It was these two that furnished money to educate George.The estate of Wakefield was left by Augustine to his son William Augustine Washington.Augustine Washington died in 1759 and his wife survived him for several years."
"William Augustine Washington, born in 1717, was married three times.First, married his cousin Jane Washington, daughter of John Augustine and Hannah (Bushrod) Washington.Second, Mary Lee, daughter of Hon. Richard Henry and Ann (Aylett) Lee of 'Chantilly.'Third, Sarah Tayloe, daughter of Hon. John and Rebecca (Plater) Tayloe of Mouth Airy."
"William Aylett, Deputy Commissary-General of Stores, 27th April, 1776; Deputy Commissary-General of Purchases June 18, 1777, and served to July 24, 1782.William Aylett was a son of the Clerk of King William County for many years.Ann Aylett married Augustine (Austin) Washington about the time he took charge of Wakefield."