I asked another question about medieval farming families, and I know the answer to this is going to also be culturally dependent, and the medieval period encompasses a large amount of time, but if anyone could answer this for the time and place of their specialty I would appreciate it.
At least for my period, we simply don't know. Peasant diaries and the like simply didn't exist, and if a monk didn't comment on it then it's beyond our reach. I can't speak for other historians of other medieval places and times, but for England as far as I know it's a we don't know.