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1930 Census, Boston, 10 Longfellow St.
Pettitt, William, owns home worth $34,000, owns radio set, male, white, age 78, married, age at 1st marriage - 35, born Eng., parents born Eng., immigrated 1880, naturalized, instructor tennis - Boston athletic club
wife Mary E., age 68, married, age at 1st marriage - 30, born Mass., father born Ire., mother born New Hampshire, no occupation
son George, age 30, single, born Mass., father born Eng., mother born Mass., mail clerk - railway, veteran of WWI
daughter Lillian J., age 27, marital status unknown, born Mass., father born Eng., mother born Mass., stenographer - butter & eggs store

WWI Draft Registration Card
George Russell Pettitt
10 Longfellow, Dorchester, Suffolk Co., Mass.
born 9 Nov. 1897
White, native born
Occupation - ship cleaner, Bethlehem Ship Building Co., Squanton, Norfolk Co., Mass.
Nearest relative - Mary Pettitt, same home address
Medium height, slight build, blue eyes, brown hair

Social Security Death Index
George Pettitt
Last Residence: Pembroke, Plymouth Co., Massachusetts
Born 9 Nov. 1897
Died Oct. 1979
Soc. Sec. Number issued in Massachusetts (1961-1962)

Massachusetts Death Index -

George R. Pettitt
Certificate # 007245 
Death Place: Boston 
Death Date: 8 Oct. 1979
Birth Place: Massachusetts 

Lillian G. Pettitt
Certificate # 038240 
Death Place: Everett 
Death Date: 17 Jul. 1988
Born Massachusetts on 17 Aug. 1901
 
The Massachusetts vital records through 1910 are here:  http://www.sec.state.ma.us/vitalrecordssearch/vitalRecordsSearch.aspx  There are entries for Florence Marie Pettitt born 1895, George Pettitt born 1897, and Lillian Gertrude Pettitt born 1901, all in Boston.  There's a marriage record for Thomas Pettitt from 1884 in Boston.

Here's a site with a picture of Thomas:  http://www.tennisfame.com/famer.aspx?pgID=867&hof_id=238

Also, a picture of him up for auction:  http://www.artfact.com/auction-lot/thomas-pettitt,-1898-1-c-qv2g0cq7fm

And a very expensive card for sale:  http://www.mdsportscards.com/servlet/the-523/1888-N29-Allen-Ginter/Detail

There is an obituary for William in the New York Times from March 6, 1931.

I found some newspaper articles that mention Thomas.

One is from a Nebraska paper from 1898 which says Thomas became the court tennis player champion of the world in 1885.  After an 1890 match, he returned to the US and took charge of the tennis department of the Boston Athletic association, except for 2 months in the summer when he was in charge of the tennis court at the Newport Casino.  

I found his obituary, which says he died in Newport on 17 Oct. 1946.  The obituary says he was born 19 Dec. 1859 in Beckenham, Kent & came to the US with his family in 1873.  It says his wife died some years ago.

An article from 1933 says he was going to Boston for the winter with his wife, so she was alive then.

One article is from a Newport, RI paper from 1950, which states Thomas Pettitt headed the Newport Casino's tennis department from 1880 to 1947.

There seems to be quite a bit about him. 

If you want to take a look at the 1900 Census, it's free here:  http://labs.familysearch.org/

1910 Census, Boston, Suffolk Co., Mass.
Pettitt, Thomas, male, white, age 50, married once, years of present marriage - 25, born England, parents born Eng., immigrated 1874 or 1879 (?), naturalized, teacher - tennis club
wife Katherine, female, white, age 43, married once, years of present marriage - 25, mother of 0 children, born England, parents born Eng., immigrated 1876, no occupation
Riestister, Emily, friend, age 18, born New York, parents born NY, occupation - servant

1920 Census, Boston, Mass., 17 Spring Park Ave.
Pettitt, Thomas, owns home with a mortgage, male, white, age 60, married, immigrated 1874, naturalized 1878, born England, parents born Eng., instructor - court tennis
wife Catherine A., female, white, age 53, immigrated 1876, naturalized 1878, born England, parents born Eng., no occupation

1930 Census, Boston, Mass., 17 Spring Park Ave.
Pettitt, Thomas, owns home worth $7,000, male, white, age 70, married, age at first marriage - 24, born England, parents born Eng., immigrated 1863, naturalized, instructor - tennis, not a veteran
wife Catherine, female, white, age 60, married, born England, parents born Eng., immigrated 1878, naturalized, no occupation

In the 1910 Boston city directory, under a list of teachers, there is "Pettitt, Thomas, 17 Spring Park Ave. (tennis)"