Both are 'mine' and I wasn't aware of the m. dates so thank you.
Do you have the references?
Both these families had a daughter and one married a Thomas Donaldson the other from the other family married Thomas' brother Alexander. So two brothers marries Airth females who were not related but both had a fther called John Airth !!!
As far as I can tell the two Airth women are not related but further back ???