Leitrim-Roscommon

I am trying to find out more information about Robert and Catherine Kelly Reilly (O'Reilly). My GGF James Reilly, son of Robert and Catherine, was baptized at Newtown Forbes on 20 Jan 1850. I have the baptism records of two of his other siblings. Both were baptized in St Mary's Edgeworthstwon: John May 2, 1852 and Mary Ann on Aug 20, 1854. The other siblings were named Robert, Kate, Elizabeth, Margaret, and Jane. All but Jane came to the US. Jane remained in Ireland and was living in Dublin at the time of her older brother John's death in 1924.
I've not been able to find a marriage certificate for Robert and Catherine or baptismal information on any other siblings.
Any assistance/advice greatly appreciated.
Thanks!
Barbara Curtis