Hi Celticvirgo
Welcome to Rootschat!
Came across this, site which answered some of the questions I was going to ask :
http://familytreemaker.genealogy.com/users/b/o/o/Bridget-Kathleen-Booth/GENE4-0002.htmlFor our reference:
1900: 5175 Dearborn Street, Pittsburgh, Allegheny PAJohn P RUSH 39, b Aug 1860 Ireland, imm 1885, in US 15 yrs*, naturalized, Fire Insurance Agent
Wife: Margaret E RUSH b Sep 1862 PA
Married 12 years and 5 children:
John P, 11, Joseph 9, Francis 6, Mary C 4, Vincent A 2mths
(*Note: 15 years in US indicates 1880 immigration)In 1910, they're in Pittsburgh they’ve added 2 more sons (Jerome 5 and Hugh W ).
John P RUSH , 49, immigrated 1881, naturalised, a self employed Real Estate Insurer
In 1920, they're in Pittsburgh. John M RUSH age 58, Real Estate Agent, imm 1881, naturalised 1893.
In 1930, they are at 1030 Lessing in Pittsburgh,
John P RUSH is 67, Retired, immigrated 1881, naturalised.
PA Death Certificate (he died on his Birthday

) :
John Patrick RUSH,
Died 5 Aug 1934
Age 73 yrs, 11mth, 20 days
Occupation: Retired
Residence 1030 Lessing, Pittsburgh
Married, Wife: Margaret DAVEY
Born 5 Aug 1860, Ireland
Father: Peter RUSH, b Ireland
Mother: Catherine McGRATH b Ireland
Informant: Wife, Margaret RUSH
Buried: St Martins Cemetery
So his wife said his father's name is Peter.
Cheers
AMBLY