I am also having this problem. I have found multiple sources detailing the royal history of the McReynolds (McRannells) family, but I cannot find the one or two missing links to complete the tree. The ancestry after Johne McRannells/McRannald (b:1639 in Scotland)becomes very vague then picks up at Domhnalll Dubh. If I am not mistaken that time from between the two leaves room for one or two missing people to complete the tree.
Does anyone else have any information?