STRACHAN, John 1
There are a great many John Strachans in the North-East of Scotland historically. This quotation makes it clear that the "Tutor" John Strachan, son of Alexander Strachan Laird of Thornton and Isobel Keith, did himself have a son named John:
"On the 18th April 1634, he (Sir Alexander, Laird of Thornton) granted a bond to John Wood of Craigniston for £3166, 6s. 8d., 'borrowed money,' the cautioners being 'John Strachan in Glenfarquhare,'described as the granter's uncle, Mr John Strachan of Muretoun, Robert Middeltoun of Caddon, and Alexander Strachan of Goislie. Among the witnesses are 'Thomas Strachan, brother to Mr John Strachan, in Glenfarquhar,' and 'John Strachan, son to the tutor of Thorntoun' (Register
of Deeds, vol. 512)."
from Memorials of the Families of Strachan and Wise by Charles Rogers (1877) 1