Hi Alex,
Nice that you also have Strathdon connections as well.
My GF was born at Craigniach in Strathdon in 1872, my GGF in Glenbucket in 1839 and my GGGF in Strathdon in 1793. I have direct Stuart/Stewart, Fraser, Michie, Sherdon connections.
I have no direct association with the Grassick name but a early family member did.
If you are looking for any Strathdon info I might be able to help.
Gerry