Second message - Laura - looked up William Muirhead who married an Elizabeth ?. They had three children - Jessie, Alexander and Gavin. No more information.
The source was a now deceased member of the Muirhead Clan Society.http://www.clanmuirhead.com
So, I suspect these two groups should be connected and will ask our clan genealogist to look into the matter. She would be delighted to assist you further. Susan Shaw is listed on the listed website.