Thank you for the baptism records.
A bit late for my family - unless I find another descendent or two. But I've saved a copy and stashed it in the appropriate file.
The birth registration of Mary, Senior, states under Children of Deceased - Living Ann 57 years, one male and two females deceased.
One would imagine that if Ann included her brother who died in the US, she would have also included any siblings who died in Ireland. But who knows?