So does this mean the late Rayan's thrid and unmentioned offspring was dead?
Far from it, it means that the offspring in question was a girl.
And girls are not to be mentioned in the faire-part (at least in the above faire-part which is full of men's names - father, male chilren, male uncles, brothers, brothers-in-law) but no females were ever mentioned.
There you go, even as a victim of marital male abuse, her death faire-part would not even speak of the women in her family.
Now, if this is not a indicator of a patriarchal society, I wonder what is!