Trying to solve the riddle of the Hogans.

I have for some years been trying to sort out the details of my Irish ancestors (3 x great grand parents on one side, and great grand parents on the other) to almost no avail.  Hopefully someone on this site can help me.

My 3xggf is shown on the usual family history sites as being Martin Hogan, born c. 1814 in Tipperary (but I have seen no documents confirming the date). He is shown as marrying in Tipperary in 1835 (again no evidence) and his wife is confusingly shown on these sites as either Mary Latham or Mary Lee.  I would obviously like to know which.  I also have no date of birth and death for Mary.

I do know that they arrived in Moreton Bay, Queensland, Australia in September 1852 on board the "Rajah Gopaul". Unfortuanely the passenger list only shows Mary as the wife of Martin, so no luck with her surname from that source.  They came with a number of children.

Their eldest child, Mary (born 1835 Tipperary, but again no docs.) was my 2xggm, and she married Henry Hall in Maitland, NSW Australia in 1858.  Henry and his parents were on the "Rajah Gopaul" with the Hogans.

Now comes even more frustration: Mary and Henry's son, James (my ggf) also married a Hogan, but from (we suppose) an entirely different family of Hogans.  He married Sarah Margaret Hogan (born 1865 in Australia) and her parents were (according the the various family history sites) Edmund Hogan (m 2ggf) born 1837 Tipperary (again no evidence or dates seen) who married either an Ann Ryan or an Ann Connell in 1859. We have no dates at all for Ann.

We don't know how/when Edmund and Ann got to Australia, but it must have been soon after their marriage as they had a child in Australia in 1860.

I would be most grateful for any possible assistance with this matter - the unknown elements have been frustrating our family for years.