Hi Hume, I'd just got there also

I'll leave the post as is:
I can see father William McGavin Reid's birth in Hamilton in 1862, to parents Robert and Mary Gibson. In 1881 the family are showing in Hackney London, with Robert father as you said a Restaurant keeper. Everyone born in Scotland apart from mother Mary who shows as being born in America.
You then have the 1886 marriage in Walthamstow for William to Elizabeth. I also found this birth which is likely for your grandfather in 1890:
Ist Qrt 1890 Robert Gibson Reid in Camberwell, Vol. 1d Pg. 918.
Monica
