Andrew Walker Annie Menzies Dryburgh

Andrew Walker / Annie Menzies Dryburgh parents of
Harry Halcourt Walker who married Hazel Chapman parents of
Rex Barton Walker who married Doris Viola Blake parents of
Lawrence Edward Walker (me)

Seeking information, tips and advice on Andrew and Annie's parents.
Believe Andrew was born in Scotland UK 1850 Unknown death date but burial at Collingwood Trinity United Church, Simcoe, Nottawasaga Ontario Canada has been claimed.
Annie born 1850 Dundee, Angus, Scotland. No death date but said to have been buried in British Colombia, possibly Vancouver area.