Elvira de Lacy & John Jacques

I am currently trying to sort out some family ties from a photgraph of my greatgrandfather's. he is a young boy of approximately 15 circa 1890 and he is with his great grandparents. The caption reads " dad's grandmother(Stephen A Bentley)aged 98 years grandfather aged 88 years grandmother's name was Elvira de Lacy homed in Manapolis(sic) Valley, Nova Scotia grandfather's name was John Jacques homed in Virginia. Greatmother was Scots & French Canadian."
Based on my great grandfather Benjamin's birth in 1872 and his apparent age of 15 years would place the photo at approximately 1888 then setting Elvira's birthdate near 1790 and place John Jacques birth at approximately 1800.
Any help would be very much appreciated.