Lester/Lyster in SeirKieran

Hello,

I'm looking for anyone who could help me further my research on my gg-grandfather, Thomas Lester (Thomas Lyster in baptismal info.-Ossory Diocese), who was born in Seirkieran, Offaly County, in 1843 to Paul Lyster and Johanna Moloy, sponsors: Rev. M or W O'Keefe and Mary Lyster (Breaghmore).  His sister, Bridget, was baptised in 1838 and, again her parents are listed as Paul Lyster and Johanna Molloy, sponsors: Patt Downy and Margaret Molloy (Clareen).  There's a third child listed in the baptismal info. of 1845 but the child's name is not given but now the parents are listed as Paul Lester and Johanna Molloy, sponsors: Mi?? Heenan and Sally Lester (Clareen).  Thomas Lester (spelling he used here in the US) said he left Ireland as a child but I can't find any immigration information for him.  He also said he had two sisters that they called Dark Kate and Light Kate.  I'm trying to find any family back in Ireland that might have more info. on our ancestors.  Unfortunately, I don't know the names of Paul Lester's nor Johanna Molloy's parents' names nor those of any of their siblings.

Thanks for any assistance.

Jeanine Chavez