Thank you, Shelia, so much for finding these in the Holy Trinity Church! It was very kind of you to look and is much appreciated.
It is difficult when the names are written in Latin with strangle phonetic spelling but looking at your discoveries I can see three of Daniel MAHER and Mary LINGUIAN's children: Charlotte (Sharlotte Mahea 1840), John (Joannis Marr 1842) and James (James Marr 1844).
There is a steady pattern of names so that keep coming up in the records. Possibilities include: John and Henry maybe Daniel's brothers (naming his children after his siblings). John's wife maybe Daniel Maher's wife sister (similar name).
Curiously there is no mention of Thomas Maher who was staying with the family on the 1851 census. He was listed as a visitor so don't know if he was related or not.
On the 1841 census Ellen was living with Daniel's family. She was born about 1761 and so could be his mother. She died sometime before 1851 so maybe in the Holy Trinity death records.
Just out of interest, are there any indications as to where in Ireland any of the families you've found have come from? Doing a Goggle search I found that MAHER and variants seem to be most popular in Tipperary? Could this be so for my family?
I haven't had much luck with Daniel's oldest son, Henry, who was possibly born/baptised in Grays Essex. Having posted a note on the Essex board I was told there weren't any Roman Catholic churches in the Grays. More work needed to pin him down.
It would be great to see the photos of the records. I've sent you a PM with my e-address. Thanks again. It's been a fantastic help!