Anthony....Here is a bit of information on the family.William did have siblings.
1930 United States Federal Census
Name: Mary C Linn Event: Census Event Date: 1930 Event Place: West Chillisquaque, Northumberland, Pennsylvania Gender: Female Age: 23 Marital Status: Married Race: White Birthplace: Pennsylvania Estimated Birth Year: 1907 Immigration Year: Relationship to Head of Household: Wife Father's Birthplace: Pennsylvania Mother's Birthplace: Pennsylvania
Household Gender Age Spouse Ralph F Linn M 25 Mary C Linn F 23 Child William L Linn M 4 Child Albert L Linn M 3 Child Doras M Linn F 1 (Doris)
Below you will find the obituary for William's sister Doris from Watsontown, Pa: