Here is a terrific response I got from Colleen Baxter. Might be useful for other family members also. Thanks Colleen.
There are actually 5 books published by Jean Turner on the family.
They are:
Book 1
Title: It Started with Muslin: Elizabeth Hopper’s Story
Author Jean Turner
Publisher Openbook Publishers, 1995
ISBN 0646226835, 9780646226835
Length 64 pages
Book 2
Title: Unwilling Tasmanians: William Hazlewood’s Story
Author Jean Turner
Publisher Turner, Jean, 1995
ISBN 0646257498, 9780646257495
Length 103 pages
Book 3
Title: A Long Road to Hobart Town: Robert Hay’s Story
Author Jean Turner
Publisher Turner, Jean, 1997
ISBN 0646342894, 9780646342894
Length 122 pages
Book 4
Title: The Bushrangers are at Hay’s House: Robert and Maria Hay’s Story
Author Jean Turner
Publisher Turner, Jean, 2000
ISBN 0957813600, 9780957813601
Length 140 pages
AND
Book 5
Title: From London to the Bush: George Brooks’ Story
Author Jean Turner
Edition illustrated
Publisher Turner, Jean, 2001
ISBN 0957813619, 9780957813618
Length 104 pages
This book was published in 2000 and records the story of Robert and Maria Hay. I’ve tried with no real success to get a copy of this book. If anyone is able to help me secure a copy I would be most appreciative.
Yews to Eucalypts 
I’ve found a way to order the book through https://copiesdirect.nla.gov.au/items/import
National Library of Australia.
Doesn’t seem any bookstores have it.
Good luck – There is another book by the same author called ” A long road to Hobart Town: Robert Hays story”
Apparently both these books are available directly from author:
Jean Turner:
4/19 Barr St, Myrtle Bank, SA 5064
Best of luck! I also will be purchasing these too books with the hope they give some wonderful insight into life for the Hay’s!
There are actually 5 books published by Jean Turner on the family.
They are:
Book 1
Title: It Started with Muslin: Elizabeth Hopper’s Story
Author Jean Turner
Publisher Openbook Publishers, 1995
ISBN 0646226835, 9780646226835
Length 64 pages
Book 2
Title: Unwilling Tasmanians: William Hazlewood’s Story
Author Jean Turner
Publisher Turner, Jean, 1995
ISBN 0646257498, 9780646257495
Length 103 pages
Book 3
Title: A Long Road to Hobart Town: Robert Hay’s Story
Author Jean Turner
Publisher Turner, Jean, 1997
ISBN 0646342894, 9780646342894
Length 122 pages
Book 4
Title: The Bushrangers are at Hay’s House: Robert and Maria Hay’s Story
Author Jean Turner
Publisher Turner, Jean, 2000
ISBN 0957813600, 9780957813601
Length 140 pages
AND
Book 5
Title: From London to the Bush: George Brooks’ Story
Author Jean Turner
Edition illustrated
Publisher Turner, Jean, 2001
ISBN 0957813619, 9780957813618
Length 104 pages
Hi my name is sharon clark ( nee hay ) i am a direct decendant of robert hay and maria hooper i would love to be able to read the five books could please be able to provide information on how to get these books thanx