Burn and Mahon of Co. Westmeath

[mmco]

Looking for information on families of a Peter Burn(es/s) b. 1797 IRE and a Margaret Mahon b. 1804 IRE.  They married c. 1822 IRE.  Family history says Peter's family was upset at the marriage and/or his family were "redcoats".  But later records show Peter was Catholic.  Baptismal records for their children were found in Ballyloughloe Parish RC, Co. Westmeath dating 1826-1847.  Two sponsors for the children were a James Burn(e) and Catherine Mahon. The entire family immigrated to New York, City, US in April 1848 except youngest son Michael (b. ~7 Mar 1847) having died prior to leaving IRE. 

Peter's occupation was a cooper according to passenger list and subsequent census.

Peter may have had brothers John and Hugh?

Thanks!

[aghadowey]

To find Irish ancestors for such an early period you need to see if church records exist.
Have a look at Introduction to Irish Records and My Ancestor came from Ireland - where do I start?.