Searching for Ann Wright and William or Thomas Vennard

I know that Ann Wright and William and Thomas Vennard were parents of my great great grandfather Thomas Wright Vennard who was born in Cloncore (Clonmore?) Armagh March 29, 1827. Thomas Wright Vennard was married to Mary Ann Taggart in Tartaraghan Parish Church. Thomas Wright Vennard's brother Joseph was married to a Mary Ann Watson. Joseph lists his father as Thomas Vennard while Thomas Wright Vennard lists his father as William Vennard so I am confused why 2 brothers would list different father names. I have no details of Ann or William/Thomas other than I believe William/Thomas Vennard was a draper on West O'Neilland land. I have a freeholder list of 1824 indicating a George, Thomas and 2 William Vennards which I believe is my 3 times great grandfather. Any information on Ann Wright & William/Thomas Vennard is appreciated.