Have you looked for deaths for Andrew Snr and wife Catherine?
I thought these might be their indexed death entries:
Andrew MCQUILTER, age 59 in 1879. Death in Greenock New or Middle, Renfrewshire
Catherine MCQUILTER/MCGOUKEN, age not indexed in 1862. Death in Houston and Killellan
See from others' research into these family lines that mother Catherine's maiden name likely has variants such as MCGOWTHRIE.
Monica