Here's brief summary. Contact me directly as I have much more than I cam post here.
William A W Sise b 1829 to William Sise (b Dublin 1793, d Tours, France aft 1840) and Sophia Woodford (b 1803 Bath, d bef 1840). Had sisters Isabella Frances b 1822 and Eleanor Barry Sise b 1824, both living with him at Tours, in 1840.
William Sise (1793- ) was the son of William Sise, b 1761 at Castlelyons near Cork, bookseller, moved to Dublin, died 9 Apr 1807, and his wife Nessia Smith, b abt 1765.
William Sise (1761-1807) had a brother Edward Sise (b 11 Jan 1762 at Castlelyons, died 26 Jul 1842 at Portsmouth, NH USA) and Edward is my ancestor.
William and Edward had six other siblings and their parents were John Sise (b abt 1720 at Castlelyons, d 1790) and Maria Murry (or Murray) b abt 1725, d 10 Jun 1788 at Castlelyons. That's as far back as I have. John Sise' forebears appear to have come to Ireland from St Ives, Cornwall somewhere around 1700 and I have some info on Size/Sise in St Ives.