Hi scotty,
In answer to your question ......
I get the impression that you won't be content until you discover whether Robert & Joseph Tennant were related, so I think you've actually answered your own question!!
You'd need to do a wee bit of research on both of them to see if this was the case and perhaps go back a generation or two.
Work out their approximate dates of birth, try to find them with their parents on Census Returns and if you have copies of Minnie's Marriage Certificates, have a look to see who the witnesses were - sometimes you can get a 'lead' if one of the witnesses has the same surname.
No quick solution unfortunately, but if this wee 'niggle' is intriguing you - it'll only get worse (speaking from personal experience!!)
Anne
