I have been studying several farming families in Avondale. While many of the children of the many powerful farming families have moved away to make their fortunes in Scotland and abroad, it is amazing how many of the core families are still there and often in the same farms.
This is certainly true of the Leipers, Lindsays, Alstons, Hamiltons, Patersons, and many others. Their surplus children left the locality but were not always the youngest. In most cases the succession to the farm depended on who was there at the time that the father died or wanted to retire. The security of the livelihoods of the parent were reliant on picking a successor who was a good farmer and that sometimes meant picking a son-in-law or a nephew.
With all of these families it is worth going back to their roots in Avondale or East Kilbride in Lanarkshire or the neighbouring parish of Loudoun in Ayrshire.
Hope that may help
Boswells.