Question: On what date was Taylor Griffin's younger brother born?

Context paragraphs:
Taylor Griffin: Taylor Griffin (born April 18, 1986) is an American professional basketball player who last played for Pallacanestro Trapani of the Italian Serie A2.  He played college basketball at the University of Oklahoma and is the older brother of Los Angeles Clippers All-Star forward Blake Griffin.

Mathias Barrett: Brother Mathias Barrett (1900–1990) was a Catholic Brother born in Ireland who founded a number of homes to help serve the needy and homeless throughout North America.  He is also the founder of The Little Brothers of the Good Shepherd.

Boreel baronets: The Boreel, later Boreel Baronetcy, of Amsterdam in the Netherlands, is a title in the Baronetage of England.  It was created on 21 March 1645 for William Boreel.  He was Dutch Ambassador to England, Sweden and Venice.  The title descended in the direct line until the death of his grandson, the third Baronet, in 1710.  The late Baronet died unmarried and was succeeded by his younger brother, the fourth Baronet.  He died without male issue and was succeeded by his first cousin, the fifth Baronet.  He was the son of James Boreel, younger son of the first Baronet.  He died childless and was succeeded by his nephew, the sixth Baronet.  He was the son of James Boreel, younger brother of the fifth Baronet.  He never married and was succeeded by his first cousin once removed, the seventh Baronet.  He was the grandson of John Hieronymous Boreel, younger brother of the fifth Baronet.  His son, the eighth Baronet, was created a Jonkheer in the Dutch nobility.  The title descended from father to son until the death of his grandson, the tenth Baronet, in 1937.

Baron Blayney: Lord Blayney, Baron of Monaghan, in the County of Monaghan, was a title in the Peerage of Ireland.  It was created in 1621 for the soldier Sir Edward Blayney.  He was succeeded by his son, the second Baron.  He was killed at the Battle of Benburb in 1646.  His younger son, the fourth Baron (who succeeded his elder brother), represented County Monaghan in the Irish House of Commons.  His elder son, the fifth Baron, was attainted by the Parliament of James II for supporting William of Orange.  He had no sons and was succeeded by his younger brother, the sixth Baron.  He was Governor of County Monaghan.  His son, the seventh Baron, was Lord Lieutenant of County Monaghan.  He was succeeded by his elder son, the eighth Baron.  He was a clergyman and served as Dean of Killaloe.  He had no surviving children and was succeeded by his younger brother, the ninth Baron.  He was a Lieutenant-General in the Army.  His younger son, the eleventh Baron (who succeeded his elder brother), was also a Lieutenant-General in the Army and fought in the Peninsular War.  Lord Blayney also represented the rotten borough of Old Sarum in Parliament.  His son, the twelfth Baron, sat as Conservative Member of Parliament for County Monaghan and was later an Irish Representative Peer from 1841 until his death.  On his death in 1874 the title became extinct.

Rhodri ap Gruffudd: Rhodri ap Gruffudd (or Prince Rhodri or Roderick Fitz Griffin) (c. 1230 – c. 1315) was the third or fourth son of Gruffydd ap Llywelyn Fawr.  He was the younger brother of both Llywelyn ap Gruffudd of Gwynedd, Prince of Wales) and of Owain Goch ap Gruffydd.  He was probably the younger brother of Dafydd ap Gruffydd of Gwynedd but may have been the older as there are no accurate records of their birth dates.

Lakshmana: Lakshmana (Sanskrit: लक्ष्मण, IAST: lakṣmaṇa, lit.  "he who have the signs of fortune") also spelled as Laxman or Lakhan, is the younger brother of Rama and his aide in the Hindu epic, the Ramayana.  He is also known by other names- Saumitra (Sanskrit: सौमित्र, IAST: saumitra, lit.  "son of Sumitra"), Ramanuja (Sanskrit: रामानुज, IAST: rāmānuja, lit.  "younger brother of Rama") and Bharatanuja (Sanskrit: भरतानुज, IAST: bharatānuja, lit.  "younger brother of Bharata").

Ray Griffin: Raymond Griffin (born June 26, 1956) is a former American football cornerback.  He is the younger brother of former two-time Heisman Trophy winner Archie Griffin, and also played college football with the Ohio State Buckeyes and pro football for the Cincinnati Bengals.

Rogers baronets: The Rogers Baronetcy, of Wisdome in the County of Devon, was a title in the Baronetage of England.  It was created in 1699 for John Rogers, a merchant and Member of Parliament for Plymouth.  His son, the second Baronet, and grandson, the third Baronet, also represented Plymouth in Parliament.  The latter was childless and was succeeded by his younger brother, the fourth Baron.  He was a Captain in the Royal Navy.  His son, the fifth Baronet, sat as Member of Parliament for Plymouth.  He was succeeded by his eldest son, the sixth Baronet.  He sat as Member of Parliament for Callington and was also a composer.  He was unmarried and was succeeded by his younger brother, the seventh Baronet.  The latter was succeeded by his eldest son, the eighth Baronet.  He was a prominent civil servant and notably served as Permanent Under-Secretary of State for the Colonies from 1860 to 1871.  In 1871 he was elevated to the Peerage of the United Kingdom as Baron Blachford, of Wisdome and of Blachford in the County of Devon (Blachford House, Cornwood, near Ivybridge).  He died childless in 1889 when the barony became extinct.  He was succeeded in the baronetcy by his younger brother, the ninth Baronet.  The latter was in his turn succeeded by another brother, the tenth Baronet, on whose death in 1895 the baronetcy became extinct as well.

Keith Griffin (American football): Keith B. Griffin (born October 26, 1961) is a former American football running back in the National Football League for the Washington Redskins.  He played college football at the University of Miami.  Griffin was featured on the cover of "Sports Illustrated" on January 9, 1984 for the story of the Hurricanes' dramatic victory over the #1 Ranked Nebraska Cornhuskers 31-30 in the January 1, 1984 Orange Bowl.  The 11-1-0 Hurricanes broke the Cornhuskers' 22-game win streak.  Keith is the younger brother to two-time Heisman Trophy winner Archie Griffin.

Blake Griffin: Blake Austin Griffin (born March 16, 1989) is an American professional basketball player for the Los Angeles Clippers of the National Basketball Association (NBA).  He played college basketball for the Oklahoma Sooners, when he was named the Consensus National Player of the Year as a sophomore.  Griffin was selected first overall by the Clippers in the 2009 NBA draft, and has since been a five-time NBA All-Star and a four-time All-NBA selection.

Supporting paragraphs: Taylor Griffin Blake Griffin
Answer: March 16, 1989