Dwyer, Moloney, Buckley, Donnelly

I am researching my Dwyer origins in the Tulla area.

Facts: Assisted passage shipping records to New South Wales, Australia, in 1855 list my G.Grandfather, Michael Dwyer arriving with his two cousins, Thomas Dwyer and Dennis Moloney, all from 'Tullagh' Clare.. These young men were aged 20,21 and 22 according to the records and had sisters living in Sydney. Catherine, Mary and Bridget Dwyer.

They were Roman Catholic and able to read and write. A 'Catherine Dwyer' paid their 3 fares on the NSW deposit journals in 1854.

Michael's parents were Thomas Dwyer and Catherine (nee Buckley).

Parents of Thomas were John Dwyer and Margaret (nee Buckley).

Mrs C.Dwyer (mother of Michael) as a widow, later married Edward Moloney. She and two Moloney daughters, Catherine and Mary, joined Michael in Victoria, Australia. He later  married Bridget Donnelly from Co.Clare. He and his cousins had purchased farms in Victoria by 1857.

                                                         Questions

What church records could hold information re. the parents etc. of my G.Grandfather and his siblings etc.? Are their any records which would give information on his mother Catherine nee Buckley, (Mrs Dwyer/Mrs Moloney)? I believe they were farmers and owned property.

How was land soldup to emmigrate? What was customary for the widow of the landholder if she remarried etc.?

Any leads appreciated. Thankyou.