1. Mary LOOBY (Caution: not verified).

It's known that John's wife's first name was Mary, but there's uncertainty regarding her last name. It's a possibility it was Looby because, buried in the same plot as Nicholas Treacy (c.1805-1848), whom we think was a brother of Mary's husband John, is a John Treacy (c.1787-1848), husband of "Mary Treacy alias Looby".     

Given that rural people in 19th century Ireland tended to marry locals, it's likely Mary Looby came from the parish of Soloheadbeg, and it's a possibility she was from the townland of Newtown because the only Loobys listed in Griffiths Valuation (1850s) for the parish of Soloheadbeg occupied land in Newtown.  

Among the sponsors at the baptisms of the children of John Treacy and Mary Looby were Eliza and John Looby, indicating they may have been siblings of Mary.

The children listed below marked 'Caution: not verified' are the children of John Treacy and Mary Looby, who may well NOT be the children of OUR John Treacy.

Looby (also spelled Luby)  is a common surname in the Tipperary/Waterford/Limerick area. It is derived from the Irish name Ó Lúbaigh which comes from the word 'lúbach' meaning 'cunning'.

Mary married John TREACY, son of 'unknown' TREACY, in poss. 2 Feb 1818 in Solohead, Co. Tipperary. John was born poss. abt. 1787 in Soloheadbeg, Co. Tipperary. He died poss. 21 Feb 1848 and was buried in Kilfeacle, Co. Tipperary.

There's a Tithe Applotment (1826) record for a John "Tracy" who leased eight acres in Soloheadbeg. This is possibly our John above. The only other Treacy listed for Soloheadbeg is Thomas Treacy. Could Thomas have been the father or a brother of our John?

If our John Treacy was the John Treacy who married Mary Looby in February 1818, then he died on 21 February 1848 aged 60 (this information comes from a headstone on a Treacy plot in Kilfeacle). It is perhaps surprising that the Treacys of Soloheadbeg were buried in Kilfeacle, approximately 12km away, rather than in the local Solohead cemetery (there's no church or cemetery in Soloheadbeg itself). There are no Treacy headstones to be found in Solohead, but of course this is no proof there are no Treacys buried there as many families in those days wouldn't have been able to afford to erect a headstone.

The (only) witness at the marriage of John Treacy and Mary Looby was Thomas Treacy, indicating he may have been a brother of John; and among the sponsors at the baptisms of the children of John Treacy and Mary Looby were Michael, Catherine, Ellen and Margaret Treacy, indicating they may have been siblings of John (baptismal records have been located for Catherine and Ellen, sisters of John) .