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I searched the subscription site Roots Ireland and located the marriage record in 1832 in Tuam. See below. I also located baptismal records for five children in Tuam. Thomas 1834 John 1835 Patrick 1837 Sabina 1842 Margaret 1844 Here is a link to the Tuam parish register https://registers.nli.ie/parishes/1082 Do you have the names for the other two children?
Let me know what questions you have.
Date of Marriage:01-Feb-1832
Parish / District:TUAM
Husband Henry Prendergast