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I searched the subscription site Roots Ireland and found the 1822 marriage reocrd for Charles Clarke and Margaret Gillan. I also located the 1836 baptismal record for Thomas and It appears he had at least ten siblings.
I have not yet found a baptismal record for Mary Ann.
Date of Marriage:01-Aug-1822
Parish / District:ST.PAUL'S ARRAN QUAY
Name:Thomas ClearkDate of Birth:
Date of Baptism:18-Sep-1836Address:Not RecordedParish/District:ST.PAUL'S ARRAN QUAYGender:MaleCountyCo. Dublin
Father:Charles ClearkMother:Margaret GillonOccupation:
Sponsor 1 /
Informant 1:Hugh CorleySponsor 2 /
Informant 2:Caroletta Mackie