In 1880, Jane Rothwell (48, born England) and Elizabeth Dunn (45, Born PA), possible daughters of George Dunn record their father as Irish and mother English. However their mother is Alice Martin (76), not Ann Mather.
If correct record, Jane Dunn would be born Bolton in 1832 which fits with 1833 marriage. There is a Jane Dunn, baptised in 1835 in Liverpool which is a fit.

Entered USA in 1848 and died 1868 in Philadelphia

George R Dunn
Date of Death: 18 Feb 1951
Place of Death: Jeanes Hosp
Race: White
Status: Widowed
Father: Not Known
Mother: Not Known
Cause of Death: Not stated (stamped Inquest Pending)
Date of Birth: 5 Jul 1863
Informant: Frank Dunn, 807 Knorr Street