Looking for Costelloes of Rathnamaddargh

My great grandmother was Lizzie Costelloe born in 1884 in dysart,her father was Matthew born in 1826 in St Mary's Athlone .

The family was a large one , Matthew married 3 times , my great grandmother 's mother was Maria Beckett, originally from Liverpool, Matthew's second wife, she died in 1887 and he then remarried a Mary Duff and had a further 3 children.

The family stayed in the village the whole time I believe Matthew died in 1914 ?

I would love more information about what happened to the whole family. My great grandmother married Michael O' Brien in 1903 and moved to Greenpark.

Liz Murphy