If and only if you make the obvious assumptions, there is a really nice answer, easy to explain in a newspaper article. Otherwise, you'd need to spend three pa

If and only if you make the obvious assumptions, there is a really nice answer, easy to explain in a newspaper article. Otherwise, you'd need to spend three pages clarifying a three sentence question. Some people have two wives. Sometimes it's legal, and sometimes it's not; either way, it happens. Maybe Jane's only husband divorced her and remarried, and his new mother-in-law is in the same boat with respect to her husband. Also, one or more of the daughters may have been adopted. Also, there are multiple definitions of "relation" and of "husband" that you might use. And, it all depends on what the definition of "is" is.