Hi - looking for details of the following;

Alexander McCandlish married Margerat Stewart 1721 at Whithorn, Wigtownshire.

John McCandlish married Barbara Stewart 1731 at Whithorn.

Is anyone able to confirm:
1) Alex and John as brothers
2) Margerat and Barbara as sisters and
3) Alex and John as sons of Andrew McCandlish & Janet Hanna of Ayr?

regards
Fiona