Hi Nicky
I have a bit of information on the Pierre Herivel and Elizabeth Queripel line. Elizabeth died in 1836 but I have no death date for Pierre. One thing that is puzzling with this family is that I have 3 other children listed:
Eliza b abt 1815 who married James Woolcock Whicker in 1835 and emigrated to South Australia in 1854
James b abt 1816 and died in 1835
Charlotte b abt 1818 and married John Berry and then there's around an 18 year gap until Marthe! I have always wondered whether Marthe was the child of Eliza or Charlotte rather than Elizabeth and Pierre.
Best wishes
Jan Sydney Oz