It is interesting how much the "upstairs" has become involved in the lives of the "downstairs."
If Sybil has a boy, he would not be the heir, correct? I'm under the impression that heir must be male directly, with no female in the line of succession. Though I suppose a claim could be made if NO direct male heir can be found.
If Matthew, as heir, could not provide a son, what further relation could there be? He's already a bit far off, isn't he?