I seen the wedding for Samuel Boyd and Mary Patterson - however there doesn't seem to be any children born to this couple.
The only Boyd children born, MMN Patterson are in 5 Edward street - and the father is John and mother Eliza
I think the clue to this all is to find David's birth certificate - as he was born between the census dates, so the chances of the address being familiar is high, and also the DOB seems to be reasonably consistent with the age 18 on his death