Darlene, thanks for that! I think it would be good to sort out the families and sources before we merge anything anyway. I've found a Scots Peerage source, which makes no mention of the name of the wife of either Angus or his son Seamus (Ragnhild was linked as the wife of both of them). I have unlinked Ragnild as wife of Seamus for the moment. Now I see that Ragnhild is linked as the daughter of Angus's brother Ranald MacSomerled-1. I'm happy to keep working on it, but if someone with more experience in the area wants to take it on, please don't think you'll be treading on my toes!!!
