A question here and just hypothetical: if the former Prince Andrew were to remarry and have further children, would those children be Lord/Lady as "the grandchildren of a monarch"? Of course, only a deceased monarch, but doesn't the rule on style hold true in that situation also? Or have I missed something in the removal of Andrew's titles/style that doesn't allow for other children to receive at least the style of "Lord/Lady"? From the wording of the statement that removes Andrew's own remaining titles/style, I don't see any additional explicit reference to "his heirs" at all.