Can I just throw a spanner in the works of the Stewart lot

I have a John A Stewart born Blair Atholl abt 1827
On the 1851 census he is with other family members..........
Alexander Stewart 50, (he's a farmer)
Margret Stewart 51, farmer's wife
Ann Stewart 13
Christian Stewart 10
Isabella Stewart 11
Margret Stewart 22, barmaid
Catherine Fleming 48, sister in law
Alexr Morrison 24, ag lab
Their address is Bridge of Fender, Blair Athol.
This John married a 2x great aunt of mine Catherine Conway (Conneway)
Any relation??? says she hopefully :-)
Sylvia