Ann Erskine (Nee Ferguson) died on the 2nd Aug 1857 in Geelong (Vic). Bdm Reg No4801.
I have a death cert for a James Erskine died 15 Nov 1887 in Castlemaine (Vic) . I think it is him , but this cert is not 100% conclusive. Also James & Ann had 6 daughters not 4. Agnes, Christina, Ann,
Martha ( my Gr Gr Grandmother ), Beatrice & ( it's hard to read ) Dinah. I also think Beatrice & Dinah died in Scotland before the family came to Australia, and Agnes died some time between arriving in 1855 and her mother's death in 1857 , although I haven't found it yet.
Hope this helps and I would love to have any more info you may have on James and Ann.
Kind Regards.
Ralph.