Think we corresponded about the McAlisters several years ago. Just wanted to let you know that using DNA testing for purposes of genealogy has changed a lot of things. The Clan McAlister of America has a surname project that's been active for several years. Look at FamilyTreeDNA.com and select McAlister project for more details. As you may know, CMA assigns family numbers to ancestors. Angus is A01; John of New Boston NH is J12; John of Northborough MA is J27; John of Bedford NH is not assigned a number since there are no records for him in our files. Descendents of A01 and J27 have been tested and are a very close match. The other two have not been tested. If we could do so, results would provide insight as to the New England families all being "near kin".
Hope you're doing well; I misplaced your email after our last contact, so was happy to see your posting here.