I am not realted to Ocsar, but this is what I find on him in the census records, Etc.
1900 TX Jones Co. Dist 100 im age 27 242/252 N. O/B? LonerganFeb 1872, 28, mar7yrs, b MO R.E.wife Apr 187525, mar7yrs, 1chb, 1liv, b IL OscarOct 18954TX P.J.Quinnstep father Aug 1844, 55 Ire. S.M.motherDec 1847, 62, 1chb, 1liv, b Eng
1910 TX Grayson Co, Dennison Ward 3, Dist 85, image 31 344/408 P.J. Quinn64, mar31yrs,b Ire S.M.64mar31yrs, 3chb, 1liv, Eng Oscar Lonergangrandson 14b TX MO US
1920 OR Clatsop Co. Astoria Ward 3, Dist 66, image 21 169/203Rosie Lonergan44 divorced, IL Us Us Oscar24 single, TX MO IL Fireman Light House Tender
1930 AK, Terr. 1st Jud. Dist, Ketchicanimage 28 250/281Oscar Lonergan 34 single, Fireman Main Boiler, b TX MO IL.
Possible Father was Bernard Lonergan age 8 in 1880 St, Louis Mo. son of Thomas and Mary Lonerganfrom Ireland , with siblings Mary 11, Bernard 8, Lillie/Willie 2, and Maggie 8/12 Mar, (This family entered twice in 1880, and in one only the first 3 childrn listed, in the second the parents had aged 6 years, and added the younger child)
1917/18 draft card; Oscar Lonergan 21, Dennison Texas, b Oct 23 1895 Dennison, single, car carpenter, He was tall with medium build, brown eyes dark brown hair, June 5 1917.
I was unable to find him on the Texas death records, nor the Social Security Death Index. This is all I can find, hope it fills in a blank or two. Howard Boswell