A William Milligan was born 5 January 1867, Bridgeton,Glasgow, the son of Agnes Milligan, ( https://familysearch.org/ark:/61903/1:1:VQQD-3MR ).
This is the familyin 1871 Census:
Name: William Milligan
Age: 4
Estimated birth year: abt 1867
Relationship: Grandson
Mother's name: Agnes Milligan
Gender: Male
Where born: Glasgow, Lanarkshire
Registration Number: 644/3
Registration district: Bridgeton
Civil Parish: Glasgow Calton
County: Lanarkshire
Address: 28 Orr Street
ED: 37
Household schedule number: 34
LINE: 18
Roll: CSSCT1871_128
Household Members:
Name Age
William Milligan 50
Agnes Milligan 25
William Milligan 4
Isabella Milligan 1