It can help though, we always assumed that she went by the name of Maureen, now we have her official name to search with results should be better! And I have you to thank for that, also, with Catherine's last address we may be able to find out if she owned it and if and when it was sold znd who by. Mary is most likely married, so that's snother angle we can use. So not bad information to start with, At keast I think?.So the will was probably made after John died. From that long ago it could be that Mary has married since then so doesn't really help.