We are looking at the same family tree... I have come across some of your information before.
I think I am a direct descendant from below... dates may not be perfect.Hope was can share information.
1. John ALEXANDER (b1590) -> 2. John ALEXANDER (b1631) -> 3. John ALEXANDER (b1658) -> 4. John ALEXANDER (b1688) ->5. William ALEXANDER (b1717) -> 6. Ambrose ALEXANDER (b1742) 7. Ambrose ALEXANDER (b1769) -> 8. George ALEXANDER (1791) -> 9. Alfred Ambrose ALEXANDER (b1813) -> 10. Alfred Ambrose Alexander (b1841) -> 11. Henry Scott ALEXANDER (b1876) -> 12. Walter Leonard Alexander (b1911) -> my dad -> ME.
Some I have from the George Ambrose is below...
10. George Ambrose ALEXANDER (b.7 Jun 1861 Emu Bay, Tasmania, Australia d.6 Sep 1932) sp: Hannah Mary RUBOCK (b.Abt 1864 m.17 Jan 1883 d.16 Jul 1951 Wynyard,T,Australia) 11. Astella Mabel ALEXANDER (b.22 Oct 1883) sp: Alexander GRAHAM (b.Abt 1880 m.1905) 12. Jack Alexander GRAHAM (b.1907 d.1944) sp: Brittania May WATTS (b.1918 m.15 Jan 1949) 13. Julie GRAHAM 13. Barbara GRAHAM (b.1950) 11. Annie Lillian ALEXANDER (b.Abt 1885) sp: BAILEY 11. Alice May ALEXANDER (b.12 Mar 1892, Wynyard,Tasmania,Australia) sp: Herbert Edgar SCETRINE (b.Abt 1885 m.1915) 11. Amy Eden ALEXANDER (b.8 May 1899 Emu Bay, Tasmania, Australia d.26 Jan 1922)