Hi Scott
Yes indeed it's the same person. I note I must have entered wrongly the date of Isabella's death and sorry meant she was born Duirinish , knew she had died in Gairloch, but had the other details correct.
Peter had married twice and I believe had two children with Catherine MacInnes, your Grandmother Isabella and a boy Kenneth John Ferguson b1906
Strangely he appears to have named Isabella after his first wife , Isabella Campbell b1858...d1901
They lived in Roag Duirinish Skye and together had four children...
Norman Ferguson b1889...d1961
Catherine Ferguson b1891...d1936
Donald Ferguson b1898...d1978
Maggie Ferguson b1899...d1979 (my Grandmother)
Isabella died when my Grandmother was a baby in 1901 and Peter remarried in 1902
When Peter died he lived at Struanmore Skye and had been the ferryman.
I can't ever remember my grandmother mentioning her half brother and sister. I do know she never got on with her step- mother and left Skye at 14 to go into service in Glasgow, where my father, who is 85 still lives. If there's anything else I can help with please let me know,
Christine