Possible family. All from familysearch.org. In 1880 census a Rosa and Otto are living with parents Frederick and Fredericka in Phil, PA.
https://familysearch.org/pal:/MM9.1.1/MWJ2-GC6
In 1900 census, Fred/Fredericka/Otto are living at the same address as Rosa Weiland and her husband 'Charles' Weiland and their 6 children. Birth year/month are given for all.
United States Census, 1880
https://familysearch.org/pal:/MM9.1.1/MWJ2-GC8
Name: Fred Moser
Residence: Philadelphia, Philadelphia, Pennsylvania
Birthdate: 1836
Birthplace: Germany
Relationship to Head: Self
Spouse's Name: Fredrika Moser
Martial Status: Married
Age (Expanded): 44 years
Occupation: Brewer
NARA Film Number: T9-1180
Page: 351
Page Character: B
Entry Number: 1048
Film number: 1255180
Household Gender/Age/Birthplace
SELF Fred Moser M/44/Germany
WIFE Fredrika Moser F/39/Germany
SON Fritz Moser M/16/Germany
DAU Rosie Moser F/15/Germany
SON Otto Moser M/9/Germany