Hello,
Thank you for your responses.
William Beatty would have been Ida Sinclair's step dad. Apparently he remarried after his wife died - no dates, but sometime after 1876, which was When MAry Jane Beatty, his daughter, was born..
We do not know the name of the step Mum - Ida's Mum. My Gt Gran apparently never spoke of her, only to say she despised her!
She allegedly went to Australia, possibley from the UK, rather than Ireland?
She possibley lived in Sydney, which it seems is where my great Uncle may have settled.
She, as far as we know kept the name Sinclair.
She is probably several spellings of Ida/ Aida, Ada Sinclair/Stclair.
We assume that she was born in Cavan, Ireland, but seems to be no record of her.
I wsh I could give you more informatiobn.
Thanks for all your help.
Much appreciated