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Plunkett Fleeson married Eliza Fleeson about 1824 - children ....
We are related to Emily 1837 who married James Elliott in Ireland about 1861 Killcun and travelled to England and then to Australia
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There's an extracted marriage record on FamilySearch with similar names and location - date is a little different however.. maybe a relation of the family you mentioned..
Groom: Plunket Fleison
Bride: Elizabeth Price
Marriage date: 28 May 1840
Location: Killucan, Co. Westmeath
The film given is 101011 and this includes a likely source for this marriage
Parish register transcripts, 1696-1835
Church of Ireland. Parish Church of Killucan
Includes baptisms, 1696-1795 with index;
burials, 1700-1772 with index;
marriages, 1787-1929;
churchwardens, 1699-1800.
Shane