I'm reading Vita Merlini for the second time, but this time in Spanish. And what do you know? Merlin has three younger brothers!
The English version of the Vita states the same, albeit in a different order.
This means that Merlin isn't just the older brother of Ganieda. Merlin is also the older brother of three brothers. That makes them a total of five siblings (including Merlin). This is such a interesting tidbit.
References
Monmouth, G. D. (2022). Vida de Merlín (R. A. Romo Estudillo & M. A. Ordoñez Cruickshank, Trans.). Universidad Nacional Autónoma de México. Facultad de Filosofía y Letras. https://ru.atheneadigital.filos.unam.mx/jspui/handle/FFYL_UNAM/7841
Monmouth, G. O. (n.d.). The Life of Merlin. Latin Arthurian Literature - Department of Anglo-Saxon, Norse & Celtic, University of Cambridge. https://www.asnc.cam.ac.uk/research/latin-arthur/texts/text-one/










