about 10 minutes of research... deboonked (edit: maybe not).

Isabella Margaret married Walter Stewart, who died within a year of the marriage - without having any children.

Isabella had 3 children with her first husband who was Sir William Fenton.

EDIT: GENi has her married to Robert Stewart and that they had a child names John... so much for the interwebs.

about 10 minutes of research... deboonked.

Isabella Margaret was not married to Sir John Stewart, but married Walter Stewart, who died within a year of the marriage - without having any children.

Isabella had 3 children with her first husband who was Sir William Fenton.