Hello Angela,
It seems that your Bradley's are definietly from the Parish of Iskaheen in Co. Donegal. I looked at the 1901 and 1911 Census for Bridge Street. I found a death for Sarah, her son William and her brother John.
Bradley: April 6, 1905 at the residence of his sister 44 Bridge Street, Derry. John Bradley. His remains will be removed for interment in Drung burying ground on Sunday 9th inst. The funeral leaving his late residence at half past nine o'clock. American papers please copy.
Faulkner: October 31, 1906 at her residence 44 Bridge Street, Derry. Sarah, wife of the late George Faulkner. Funeral will leave her late residence for interment in Drung burying ground today, Friday 2nd November at half past nine o'clock. American papers please copy.
Faulkner: June 1913 at the Western Hospital, Glasgow. William, second son of the late George and Sarah Faulkner. His remains will be removed from his sister's residence 34 Bridge Street, Derry for interment in Drung burying ground today, Friday 27th inst at half past nine o'clock. American papers please copy.
The paper may have made an error with the house number!
Drung graveyard is in the Parish of Iskaheen.
If I find any more information, will let you know.