Thanks for your kind and thorough reply. Have found much additional information, with still some questions.The BLanche Bright you noted in 1920 is in Stark County, which fit's better nearby Richland County, so father still not verified.
Blanche Bright is possibly daughter of David Bright:
1920 census of Mansfield, Richland County OH
David H Bright, 39, b Wales, laborer, Steel Mill, wife, Lulah, 33, b OH, parents b OH, daughter, BLANCHE, 13, b OH. David Blanche immigrated 1887, naturalized 1892.
Regarding ancestry of David Bright:
1900 in Trumbull County OH:
William Bright, 44, b England, Tin Mill doubler, Sarah, 44, b Wales, with children born Wales: David, 20, William, 18, Isaac, 15, Eufoyn, 13, and children b Ohio, Eadrin, 9, Edith, 7 and Sarah, 4.
1910 census of Stark County Ohio:
William Bright, 54, b Wales, working in Tin Mill, Sarah, 54, b Wales, (mother of 9 children, 7 living), children all born OH(parents b Wales), Aden, 19, Edith, 16, Sadie, 14, granddaughter BLANCHE, 4, b OH, parents b OH/Wales, mother(of who?), Mary Hagan, 51, widow.
1920 census of Stark County Ohio:
William Bright, 64, b England, watchman, Sarah, 63,b England, d, Sada[Sadie] C, 23, b OH, d, Edith M Mizer, 26, son-in-law, Guy B(?) Mizer, 29, b OH, gd, Mycial(sp?) M Mizer, 3, b OH. This record seems to show Edith Bright married Guy Mizer ~1916.
Response from Bright with common ancestry stated that William Bright was son of Thomas and Catherine Bright of Wales.
Ohio records show William Bright, b 1856, died 1921, Canton Ohio. Father listed as John(?) Bright, mother stated as unknown, wife Sarah.
Ohio records show Sarah Bright died 1936, Stark County Ohio. Parents listed as John Hill and Elizabeth Thomas.
Ohio records show David H Bright, b 12 Apr 1880, South Wales, d 1938, Cleveland Ohio, wife, Lulu, father William Bright, b Britian Ferry S Wales, mother Sarah Hill, b Wales.
1930 census of Canton, Stark County Ohio, includes BLANCHE A Bright, age 24, b OH, parents b OH/Wales, single, shown as daughter in household of Fredd Beste, 32, and family. Note about mother in comments, so not clear relationship. Not confirmed this is same Blanche Bright, but matches well on age and birthplace of mother.