Peter Dennis...Gone fishing!, I agree that the ex makes no sense, if we keep him as a partner. (There are two young men he is associated with as a lifelong friend & mentor: Gian Giacomo Caprotti da Oreno, who entered his household in 1490 at the age of 10 and Count Francesco Melzi, the son of a Milan aristocrat who was apprenticed to Leonardo by his father in 1506, at the age of 14, remaining with him until his death)
Perhaps someone was trying to suggest he turned from the one to the other. More likely, someone made him ex when they added the wife?)
But what I'm saying is that there is no historical evidence at all that they were anything but friends or acolytes. None! It's all the conjecture of historians hundreds of years later. See: http://en.wikipedia.org/wiki/Personal_life_of_Leonardo_da_Vinci
I'm loathe to add these two guys as partners on this absence of evidence. If we do that, we would be adding partners to contemporary movie stars on a monthly basis.
And if we don't add boyfriends and girlfriends as partners on profiles (unless they are live in life partners), what justification do we have for adding his proteges as life partners to a man who said "The act of procreation and anything that has any relation to it is so disgusting that human beings would soon die out if there were no pretty faces and sensuous dispositions."?
Personally, I think there is a chance that he might have been in a relationship with them, but as there is no evidence at all - even in his hundreds of letters - that he thought he was, it seems to me ahistorical for us to link them on geni.
Leonardo's managers & curators need to weigh in here, including on the interesting subject of the portraits. I Just raised a question that had been directed to me.