From the Social Security Death Index: First Name: Francis Last Name: Milligan Birth Date: 12 November 1909 Social Security Number: 380-16-0523 Place of Issuance: Michigan Last Residence: Hazel Park, Oakland, Michigan Zip Code of Last Residence: 48030 Death Date: September 1979 Estimated Age at Death: 70 The SSDI record is here: https://familysearch.org/pal:/MM9.1.1/J1X5-KYS
Francis Joseph Milligan appears on the 1910, 1920, and 1930 censuses as the son of Patrick and Mary Milligan.This is from the 1910 census: Household Gender Age HeadPatrick MilliganM 48y born Canada SpouseMary MilliganF 29y born Germany ChildPatrick MilliganM 8y born Michigan ChildMary Alice MilliganF 7y born Michigan ChildPhilip MilliganM 6y born Michigan ChildJames Denver MilliganM 1y born Michigan ChildFrancis Joseph MilliganM y 5m born Michigan Emma OlesonF 21y born Sweden The 1910 census record is here: https://familysearch.org/pal:/MM9.1.1/ML5M-9R6
The 1920 census has added a younger sister: Household Gender Age HeadPatrick J MilliganM 59y SpouseMary MilliganF 40y ChildPatrick MilliganM 18y ChildAlice MilliganF 17y ChildPhilip MilliganM 16y ChildJames MilliganM 12y ChildFrancis MilliganM 10y ChildMargaret MilliganF 8y The 1920 census is here: https://familysearch.org/pal:/MM9.1.1/MZSG-4D7
The 1930 census: Household Gender Age HeadPatrick J MilliganM 69 SpouseMary MilliganF 50 ChildMargaret MilliganF 18 ChildFrancis MilliganM 20 The 1930 census is here: https://familysearch.org/pal:/MM9.1.1/XQYZ-B8N
The 1940 census has been published, but not yet indexed.It may show Francis and his family after his marriage.Check back in a few months.