Hi! I'm in the process right now of transcribing cemetery records for a downtown city cemetery in Dallas, TX and have noticed a lot of Irish families settled here from County Clare, Kerry, Tipperary, Galway, Mayo, Roscommon, Longwood to name a few.
I have found your Langton burials in a family plot and most of the members were born in Ireland between 1810 and 1830 and died about 1888 - 1929. I took photos of their tombstones in order to organize those with tombstones and those without tombstones to compare against a very early plot map. Fortunately, Langtons have flat tombstones that were not vandalized!I found an Obit for a Miss Kate Langton (1942)that mentions a nephew by the name of Neil Merzbacher of Mount Pleasant, Tx.Would that be a grandfather or great uncle to you?
Contact me below and I'll attach photos of Langtons in my reply.