Moray Council has a Local Heritage page with an on-line Index http://www.moray.gov.uk/moray_standard/page_1537.html
Looking for "Logan" brings up a possible entry for George Gordon Logan which gives his parental details.
There is however, a definite match for Elizabeth Logan nee McWilliam. Among other things it suggests she is buried in Surbiton Cemetery, Essex. Doing a web search on this brings up http://www2.kingston.gov.uk/GraveRecords/
where both Elizabeth and a George G Logan are listed in the same grave.
The John Logan listed by Jo-Ann in her post is listed here. Only further information is his spouse is Isabella Gerrie. ScotlandsPeople has a marriage record in Morayshire for 1941 (which is outwith the on-line availability).
The 1977 entry for Daniel is listed but all it gives is his wife's name - Peggy. A Margaret "Peggy" Logan is listed. SP has a possible marriage in 1939 (which once again is outwith the on-line availability).