See Will of her brother John Ruck of Sheldwich wherein he leaves bequests to children of Thomas Oliver "his brother-in-law". As this John was not married at the time of his death, noted by the absence of a bequest to a wife, then the only other relationship that Thomas Oliver could fill would be that of a spouse of one of John Rucke's sisters. This Johan is the only sister of John Rucke for which no marriage has been found.
