I found an online marriage reference:

Mr Alexander Kincaid
Marriage Date: 3 Dec 1857
Marriage County: St Louis Missouri
Spouse Name: Miss Meeky Kincaid

Alexander Kincaid
Marriage Date: 1858
Marriage County: St Louis
Spouse Name: Merky Kincaid

1860 Fannin County Texas Census states:
A Kincaid 27 cabinet maker
M A Kincaid 22 b: 1838 Missouri

Is this the same Alexander Kincaid and Mary Ann Cantwell?

You can contact me at brendaboen@yahoo.com

Brenda Kincaid Boen