The documented family tree starts with Duncan Allanach.
Group A
Duncan Allanach 1749-1807 & Sophia Glass 1750-1832
James Allanach 1773-X & Isabelle Rannie (1789-1873) – Their issue form Group A.2
Margaret Allanach (1776-1866) & James Robertson
John Allanach (1776-1841) & Elizabeth Allanach – Their issue form Group A.3
Jane Allanach (1780-1841) & James Forbes
William Allanach (1782-1841) & Isobel Grassick – Their issue form Group A.4
Alexander Allanach (1784-1841) & Catherine Chrues
Isabel Allanach (1785-X)
Duncan Allanach (1789-1789)
Robert Allanach (1789-1789)
Sophia Allanach (1790-1880) & William Crabb
Jochabed Allanach (1792-1866) & William Chalmers
Duncan Allanach (1795-1832)