Forget all that rubbish I put in the last post, must have got side tracked, I'll stick with Francis, Pearce and Swan.
You said one of the children married a Swan in NZ was that Stephen Swan and Sarah Ann Francis if so it looks like Stephens mother may have died November 30, 1827 age 31 and not 1940.
Also I'm tuning up some interesting info which you may or may not have. Sarah Ann Francis maybe half sister of Elizabeth Philps daughter of John M. Francis and Frances Francis. Elizabeth b.March 13, 1837, Maidstone, Kent, died May 6, 1913, Feilding, Manawatu District, Manawatu-Wanganui, New Zealand. The only prob I can see with this is that it goes back to John M. Francis, b. 1800, Staffordshire which you have already rejected.
Hi Ho another day tomorrow