Families of Patrick Kelly and Isabella McGrener

I am looking for information on the children, siblings, parents of Patrick Kelly and Isabella McGrener. I have located the marriage of Patrick and Isabella in April 1888 at Kilcoole, Co Wicklow where the parents names are mentioned: for Patrick we have James Kelly and Ann Purcell, and for Isabella we have John McGrener and Joanne Byrne. I have located numerous children for James and Ann starting about 1837 but have not located a marriage record for them. I have not been able to locate any information on the McGrener family whatsoever, in particular the marriage of John and Joanne, or Isabella's birth/baptism - when I type in the surname (especially on RootsIreland) it says there is no matching surname. Can anyone help with these questions to enable me to further my research on these families. Many thanks.