Your query about Margaret Jane intrigues me as we have a Margaret Jane among the families of our forebears. She was born on 23 Feb 1862 and died 10 months later. Her mother was Elizabeth Thomas who married Evan Rees on 19 July 1847. He had a jewellery business in Dowlais (South Wales - near Merthyr Tydvill). After a few years of marriage they decided to emigrate to Australia's gold fields. He lay one night on a stone floor, feel asleep, caught cold and died, leaving a widow with two small boys (Thomas Rees - 1849 and John Rees - 1851). Elizabeth then remarried. Her new husband's name was Thomas John Thomas.
Thomas Rees (the son from Evan) took the name of Thomas Rees-Thomas for his surname, recognising the natural father and his stepfather, for whom he must have had some significant affection.
Thomas and Elizabeth then had 6 children: Elizabeth (1828); Mary Ann Catherine Victoria (1858); David Benjamin (1860); Margaret Jane (1862 - died 10 months later); Maurice Daniel (1865 - I think); and William James (1868).

There is no record of a Richard in our lineage. However the fact that Margaret Jane is the name you refer to it left me wondering if there could be some family connection or significance in that full name.

If you have any further information about you side of the Rees-Thomas name I should be very grateful to hear from you. Particularly if you have any information pre-dating 1770.

Best wishes in your research.

Harvey Rees-Thomas,
Wellington,
New Zealand