middle initial from1920 census here (lists family name as Johnston, he as "Johnnie M."): https://familysearch.org/ark:/61903/1:1:MZVX-DS7 listed as John Mack Johnston in birth record here: https://familysearch.org/ark:/61903/1:1:VHTK-3X6
This week's featured connections are Redheads: John is 21 degrees from Catherine of Aragón, 22 degrees from Clara Bow, 29 degrees from Julia Gillard, 16 degrees from Nancy Hart, 18 degrees from Rutherford Hayes, 19 degrees from Rita Hayworth, 23 degrees from Leonard Kelly, 24 degrees from Rose Leslie, 23 degrees from Damian Lewis, 17 degrees from Maureen O'Hara, 27 degrees from Jopie Schaft and 39 degrees from Eirik Thorvaldsson on our single family tree. Login to see how you relate to 33 million family members.