Lukes obituary lists 2 sons/2daughters. Found marriage records for Luke Jr., Judith, and Marguerite, although dob not given. Finda grave has dob and dod for Philip and Marguerite.
Source: "United States, GenealogyBank Obituaries, 1980-2014," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:QKWM-MNLM : accessed 23 May 2016), Luke Joseph Ferguson Sr, Maine, United States, 03 Jun 1997; from "Recent Newspaper Obituaries (1977 - Today)," database, GenealogyBank.com (http://www.genealogybank.com : 2014); citing Portland Press Herald, born-digital text
Luke Joseph Ferguson Sr: Obituary
Elaine Tebbetts Ferguson Wife
Philip A Son
Luke Ferguson Jr Son
Marguerite Nobert Dau
Mrs Judy Morin, Dau
Robert Morin Son-In-Law
Source: Maine, Marriage Index, 1892-1966, 1977-1996," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:KCJL-55M : accessed 23 May 2016), Robert L Morin and Judith N Ferguson, 01 Jul 1964; citing Marriage, Maine, United States, State Archives, Augusta
Name Robert L Morin
Marriage 01 Jul 1964, Maine
Spouse Judith N Ferguson
Certificate Number: 5364
Source: "Maine, Marriage Index, 1892-1966, 1977-1996," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:KCJJ-BWK : accessed 23 May 2016), Luke J Ferguson and Yvette R Berube, 01 Jan 1963; citing Marriage, Maine, United States, State Archives, Augusta.
Luke J Ferguson
Marriage 01 Jan 1963 Maine
Spouse Yvette R Berube
Certificate Number: 821
Elaine A Tebbetts Ferguson http://www.findagrave.com/cgi-bin/fg.cgi?page=gr&GRid=116159133
Philip Albert Ferguson (son) Jul. 5, 1936-Jun. 2, 2007 http://www.findagrave.com/cgi-bin/fg.cgi?page=gr&GRid=111417637
Marguerite Elaine Ferguson Nobert Jul. 11, 1928-Sep. 20, 2004 http://www.findagrave.com/cgi-bin/fg.cgi?page=gr&GSln=Ferguson&GSiman=1&GScid=192656&GRid=116237726&