If you haven't already I suggest getting Sadie's death certificate and obituary. You can get the latter from the PA Div. of Vital Records in Newcastle, PA. For Peter it's a lot more difficult. You first need to determine when Peter died and then request his death certificate.
There was a Sadie D. Moffit born in Aug 1883 listed in the 1900 census as the daughter of Charles and Sarah living in Folsom, Delaware County, PA, but I suggest you need to supply or find more info before you can be sure it is her.
The 1870 and 1880 census records show a Peter Wortman born ca 1870 as the son of John and Catharine living in Danville, Montour County, PA. I couldn't find any Peter in the 1900 or 1910 census. I did find the one above in 1920 census living in New Creek, Mineral County, WV. However, according to WV marriage records he was single when he married that wife.
Do you know where in Pennsylvania Peter or Sadie lived? Did either have any siblings that you know about? Even supplying their children's names might help.