The following has been taken  from pages 192-193 from *The Royal Descents of 500 Immigrants*
by Gary Boyd Roberts, Genealogical Publishing Company, Baltimore, 1993.
 

1. Edward III, King of England, d.1377 = Philippa of Hainault

2. Edmund of Langley, 1st Duke of York = Isabel of Castile

3. Constance Plantagenet = Thomas le Despencer, 1st Earl of Gloucester

4. (illegitimate by Edmund Holand, 4th Earl of Kent) Eleanor Holand
= James Touchet (or Audley), 2nd Baron Audley

5. Contance Touchet (or Audley) = Robert Whitney

6. Eleanor Whitney = John Puleston

7. Jane Puleston = Sir William Griffith

8. Mary Griffith = Sir Randall Brereton

9. Jane Brereton = Nicholas Robinson, Bishop of Bangor

10. Piers Robinson alias Norris = Margaret Fowke

11. Eleanor Robinson alias Norris = John Maudit

12. Isaac Maudit = Elizabeth Berryman

13. Jasper Maudit = Elizabeth King

14. Elizabeth Maudit = Thomas Wright

15. Anne Wright = Samuel Lawford

16. Samuel Lawford = Margaret Sarah Acland

17. Thomas Acland Lawford = Janet Turing Bruce

18. Sir Sydney Turing Barlow Lawford = Mrs. May Somerville Bunny Coooper Aylen

19. Peter (Sydney Ernest [Aylen, later]) Lawford, known as Peter Lawford (1923-1984) of California, actor,  oo (1) Patricia Kennedy, daughter of Joseph Patrick Kennedy,
the financier and diplomat, and sister of John Fitzgerald Kennedy, 35th U.S. President, 
of Robert Francis Kennedy, U.S. Senator and Attorney-General, of Edward Moore
Kennedy, U.S. Senator, and of Mrs. (Robert) Sargent Shriver, Jr. (Eunice Mary Kennedy),
wife of the Democratic vice-presidential candidate in 1972;
(2) Mary Anne Rowan; (3) Deborah Gould; (4) Patricia Seaton.
 

Genealogical Information on Peter Lawford: 

The Following has been taken from Peter Lawford: 
*The Man Who Kept the Secrets* by James Spada, August 1992. 

Peter Lawford's name given at birth was Peter Sydney Ernest Aylen. Both of his parents were married to other people.
His father, Sir Sydney Turing Barlow Lawford, was born on November 16, 1865 in Tumbridge Wells, Kent, England. His first marriage was on September 30, 1893 at St.Paul's Church in Knightsbridge to Ms. Lillian Maud Cass, who died on November 26, 1900. His second marriage was on May 20, 1914 in London, England to Muriel Williams, daughter of Hartley Williams who was also married to Jessie Lawford, Sydney's sister.
Peter's mother, May Somerville Bunny, was born on November 4, 1883 in London, England to Frank William Bunny and his wife Caroline Stanley Todd. Her first marriage was on July 1, 1902 at St. Peter's Church in Ealing to the China born Henry Ashley Cooper, who later committed suicide on January 5, 1905. Her second marriage was on November 1, 1906 at St. Jude's Church in Portsea to Ernest Vaughan Aylen son of Samuel Aylen.
Peter Sydney Ernest Aylen was born on September 7, 1923 in London, England. His mother's divorce from Ernest Aylen was granted on October 9, 1923 and his father's divorce from Muriel (Williams) Lawford was granted on November 2, 1923. Sydney and May were then married on September 11, 1924 in London, England. Peter's last name was then changed from Aylen to Lawford. 

Peter Lawford died on December 24, 1984 in Los Angeles, California. Diagnosis: Cirrhosis of the Liver.