That is good that you have found somebody knew and potentially a sibling to Jane. The Vinney angle, whilst a pain as you want everything ticked off properly, is no longer a block for this being Jane's family I think. You also have the issue of the first child born to Jane not many months after her marriage in 1856 as DEVINE, have her as FORGIE....before moving on to VINEY. All a bit of a mess this issue of her use of surnames.
Even her mother's name is at issue. The 1856 marriage for Jane as Devine gave her mother as JANE Lambie. Jane's 1871 death cert gave her mother as MARY Lambie, wife of William Ferguson. Mother showed as deceased in 1871, which would make sense if she died in 1856.
What did it say re her mother in 1856? Alive or deceased?
Let's keep clear headed

Monica