Current research suggests that Donald was actually the son of Malcolm MacAlexander - the brother in law of Somerled - and the prisoner of Roxburgh with his father.
see https://www.geni.com/discussions/151557?msg=1364914
*[https://www.geni.com/projects/Malcolm-MacEth-vs-Malcolm-MacAlexande... Malcolm MacEth vs Malcolm MacAlexander]
*https://en.wikipedia.org/wiki/MacHeths
Presently, Cawley has him as a son of MacEth:
https://fmg.ac/Projects/MedLands/SCOTTISH%20NOBILITY%20LATER.htm#_T...
BUT Cawley has yet to update what he alludes to here: "There would be no such restriction on the date if Malcolm son of King Alexander I and Malcolm MacHeth were two different persons as suggested by Duncan[10].
Presently Cawley has the following:
DONALD (before 1134-after 1156). The Chronicle of Melrose records that "Dovenald the son of Malcol was captured at Witern, and imprisoned in the tower at Rokesburc along with his father"[11]. John of Fordun’s Scotichronicon (Continuator) records that "Summerledus regulus Ergadiæ et sui nepotes, filii…Malcolmi Macheth" rebelled against King Malcolm IV in the first year of his reign and that "nepos eius unus filiorum Malcolmi Macheth, Dovenaldus" was captured "apud Quhythern" and imprisoned "in eadem turre de Marchemond cum patre suo"[12].
BUT Alasdair Ross's excellent research work in 'The Identity of the Prisoner of Roxburgh: Malcolm son of Alexander or Malcolm MacEth?' in S. Arbuthnot, K. Hollo, and A.Ross (editors), Festschrift: Essays in honour of Professor Colm Ó Baoill, (forthcoming, 2004)
demonstrates that this is based on the 'Gesta Annalia I, (c.1250) THE VERACITY OF WHICH IS DISCREDITED BY ROSS AS A MANGLING OF PREVIOUS TEXTS
Rather than merge them, I'm actually going to cut relationships and isolate the Donald MacEth profile, but keep it- so that the now numerous references to it in the Discussions and project[?] still make sense.
I'll transfer all info, and invite the two managers to the other profile.