It looks like you and I are (very!) distantly related.
I too am descended from Robert Kinghorn and Janet Landles. They had a son, Robert (b.1825) who married Margaret Reay. They in turn had a son Robert (b.1846)who married Sarah Wetherston. Their son Robert (b. 1879) married Jessie Small Wight and their son Thomas Wight Kinghorn (b. 1907) was my grandfather.
I've got further information upon siblings, marriage dates etc. of all the above if you are interested.