I may have traced Patrick Brennan and Mary Ann Jordan's son Thomas to Portage La Prairie, Manitoba.
Thomas is listed on the 1851 Holland census with a birthdate of about 1843 in Ontario.
There is a birth record for a Margaret Antoinette Brennan in Dornoch, Ontario, 31 Mar 1883, with the parents Thomas Brennan and Mary Jordan.
in 1901 Thomas Brennan b 31 Mar 1843 and Mary Jordan b 7 Aug 1849 are living with several children, including daughter Margaret Antoinette b 31 Mar 1883. They are also there in 1911.
The other children seem to be:
James b Sept 1874
John J. b Dec 1875
Ginevra, b 17 Jan 1877
Martin, b 12 Dec 1788
Elizabeth, b 22 Jan 1881
Thomas, b 7 Jul 1885
Isabella, b 6 Dec 1887
Patrick, b 30 Dec 1889
Mary, b 5 Nov 1893
Margaret's birth records also mentions that at her birth Mary already had 6 children, 4 of whom were living.
The only fly in the ointment is her birth records lists Thomas' place of birth as Perth, Ontario. I don't know when Patrick and Mary Ann arrived in Holland Tp, although they were there by 1851.
Anyone with Brennans in Manitoba?
Chris