William Avery was born about 1622 in Arborfield, Berkshire, England He is the son of Robert Avery and Joane Unknown. This profile accepts that he is William eldest son of Robert Avery who drafted Will of Robert Avery of Wokingham found in the Diocese at Doctor's Commons; Dated March 30, 1642; Proved June 15, 1644. 
When William's father died around 1643, he inherited upon his mother's death or remarriage "all that my p'cell of land called great dowles, allis upper dowles, to remain unto him and to his heirs forever."
William married Margaret Allright around 1645; they had three children in England.
William emigrated to America around 1650 with his wife and three children. They settled in the town of Dedham in the Massachusetts Bay Colony where he built their house under the "Avery Oak". He and his wife were admitted to the in Dedham February 16, 1640. They had four more children there.
William had a blacksmith shop in Dedham and worked his trade as can be found in the town records. He is mentioned as "Sergeant", then as "Deputy to the General Court" and in 1675 as "Doctor". Still later he appears in a military organization as "Lieutenant". He is credited with opening the first apothecary shop in New England.
His wife, Margaret, died September 28, 1678, in Dedham.
William moved to Boston in about 1680. He left the homestead to his descendants who occupied it for many generations. Eventually, opened a bookstore in Boston.
William married Mrs. Mary (Woodmancy) Tapping. She died 21 May 1707 aged 78. 
Mary, baptized December 19th, 1645, in Barkham, England. Married, November 5th, 1666, James Tisdale, of Taunton, Mass., born 1644. She died September 9th, 1713. He died January 15th, 1715.
William, baptized October 27th, 1647, in Barkham, England. Married, September 21st, 1673, Mary Lane, of Maiden, Mass., born 1652. He died December 15th, 1708. She died October 11th, 1681. They had four children.
Robert, baptized December 7,1649, in Barkham, England. Married, April 3rd, 1677, Elizabeth Lane, of Maiden, Mass., born 1655. He died October 3rd, 1722. She died October 21st, 1746. They had six children.
Jonathan, born May 26, 1653, Dedham. Married, July 22, 1679, Sybil Sparhawk, of Cambridge, born “about 1655.” He died September 14th, 1694. She died August 6th, 1708. They had four children.
Rachel, born September 20th, 1657, Dedham. Married, May 22, 1677, William Sumner, of Boston, born February 9th, 166_. She died soon. He died July 20, 1703, Middletown, Conn.
Hannah, born September 27th, 1660, Dedham. Married, May 22nd, 1677, Benjamin Dyar, of Boston. She died September 15th, 1678.
Ebenezer, born November 24th, 1663, Dedham. Died before 1683, as he is not mentioned in his father’s will.
↑ Birth date: abt 1622 Birth place: Arborfield, Berkshire, England Baptism date: 24 Jul 1622 Baptism place: Arborfield, Berkshire, England England & Wales Christening Records, 1530-1906, Provo, UT, USA (Ancestry.com) On Ancestry.com The E&WCR is an extra subscription charge on Ancestry.
↑ Committee on English Research. "Genealogical Research in England." New England Historical and Genealogical Register, Volume 63. Boston, MA: October 1909. (Online database: AmericanAncestors.org, New England Historic Genealogical Society, 2001-2018.) By Subscription. Page 362.
USIMR: Passenger and Immigration Lists Index, 1500s-1900s, Yates Publishing, Provo, UT, USA (Ancestry.com) On Ancestry.com The marriage record in the USIMR on Ancestry.com gives only "Margaret Allright" (female), "William Avery", Spouse (William) Birth Place: En; Spouse (William) Birth Year: 1622; Marriage State: En. No precise date or place of birth or parents for either.