joyweave on Family Tree Circles

The following BROWN family members arrived in St-Calixte de Kilkenny, QC and Ste-Sophie, Terrebonne, QC between about 1820 and 1850: Temperance , wife of Brereton ALLEN; David; Alex; Eliza, marr. Alex HAMILTON; Margaret, marr. John LIVINGSTON; Mary, marr. John WEAVER (in USA); Florence, marr. George ELDER. At the LDS site, there's a reference to the marriage of Temperance BROWN and Brereton ALLEN occurring in Co. Laois. I am trying to establish whether Mary and Florence BROWN, known to be sisters, are also sisters of Temperance or David. (There's fairly good basis to believe they relate to the other BROWNs named here). If I can establish a connection to Temperance, I can establish a connection for Mary to a place of origin. She is my husband's gggm.
I would like to find Church of Ireland baptisms for these BROWNs, but the LDS catalog does not seem to include those records for Co. Laois.