Not in any of the books.
Grace Annie Lockhart died in 1916.
James Haldane Stewart Lockhart died on 1937-05-26.
Tre Lockhart goes by Tre Lockhart.
Tre Lockhart is 5' 7".
Emma Lockhart is 16 years old (birthdate: December 15, 1994).
It is never mentioned.
John Gildroy Grant died in 1970.
John Gildroy Grant was born in 1889.
Byrd Lockhart died in 1839.
Lockhart Duff died in 1858.
Frank Lockhart died in 1928.
Samuel Lockhart died in 1933.
Tommy Lockhart died in 1979.
Charley Lockhart died in 1954.
Caroline Lockhart died in 1962.
John Gibson Lockhart died in 1854.
William Ewart Lockhart died in 1900.