There is a John Morrell born c1816 in Kent Co. NB on the 1891 CDN Census - found on Ancestry.com I can't access the complete record.
Contact the Moncton Public Library as they publish a number of articles about the people of Kent Co. See if they have a longer write-up on John Morrell's death in 1892 - they do obit lookups.
You didn't mention if you have his Land Petitions - great records: - this looks like him
http://archives.gnb.caRS108 :: Index to Land Petitions: Original Series, 1783-1918
Name MORREL, JOHN
Year 1855
County Kent
Microfilm F5932
Here are some possibilities for his daughters (from
http://archives.gnb.ca)
Index to County Birth Registers
Child LEBLANC, ROSANNE
Sex F
Date of Birth 1895 | 02 | 09 (Y-M-D)
Place NOTRE DAME
County KENT
Father LEBLANC, THOMAS
Mother MORROL, MARY
Code 8-1-139-357
Microfilm F14035
Index to County Birth Registers
Child GRAHAM, GEORGE
Sex M
Date of Birth 1891 | 05 | 21 (Y-M-D)
Place KOUCHIBOUGUAC
County KENT
Father GRAHAM, CHRISTOPHER
Mother MORRELL, MARY
Code 8-1-59-338
Microfilm F14035
It is odd that they just disappeared... and that there are no cemetery records for this family.
I would check the Drouin Collection on
www.ancestry.caThese records contain people of many different religions and not just Acadians for the Kent Co., NB area.
Good luck,
Shirley