hedgehog on Family Tree Circles

Biddy [Bridget] Sheridan arrived in OZ on the Orphan Ship Derwent circa 1849.
She travelled with her supposedly sister Fanny [Frances Sheridan].
I do not think that they were sisters, Biddy Sheridan married Edward Miller,they probably thought it better to travel as sisters!!
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Sheridan Biddy 15 Glen, Cavan NA RC Empl. John Daly, Moonee Ponds, ?6, 2 yrs, apprentice. Married Edward Miller in 1851, farmer, Moonee Ponds, Edgecombe and Malmsbury, 6 children. She died by drowning 25 Feb 1863, buried Kyneton. Kyneton Guardian 28 Feb. 1863.
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I have not been able to trace any of her children and have drawn a blank with the
Kyneton Guardian re her death. She may not even be part of 'my' family tree if she isn't Fanny's sister, but Fanny is just as much of a problem even though we have a large family of descendant Walshams of hers who live in NZ.
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Fanny Sheridan married Joseph Walsham - as Fanny Carson
Name: Joseph Walsham
Sex: Male
Father: Joseph Walsham
Mother: Ann Holmes

Individual Facts
Birth 30 Oct 1817 in Ranby
Census 1881 in Not on 1881 census born abt 1817 anywhere in UK
Death 28 Sep 1903 in Dunedin NZ

Marriages/Children
1. Frances (Fanny) Carson
Marriage 3 Aug 1850
Children Mary Ann Walsham (b 1851)
Rebecca Walsham (b 1854)
Elizabeth Walsham (b 1855)
Jane Walsham (b 1860)
William Walsham (b 1862)
Josephine Walsham (b 1867)
Nora Jane Walsham (b 1871)
Alice Walsham (b 1874)
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Name: Frances (Fanny) CARSON
Sex: Female

Individual Facts
Birth abt 1833 in Downpatrick Ireland
Death 11 Jun 1896 in Dunedin NZ

Marriages/Children
1. Joseph WALSHAM
Marriage 3 Aug 1850
Children Mary Ann WALSHAM (b 1851)
Rebecca WALSHAM (b 1854)
Elizabeth WALSHAM (b 1855)
Jane WALSHAM (b 1860)
William WALSHAM (b 1862)
Josephine WALSHAM (b 1867)
Nora Jane WALSHAM (b 1871)
Alice WALSHAM (b 1874

We do have more information on Fanny, but Biddy is certainly a problem.

Regards to all, and special thanks to Tonkin of Family Circles.Roy Walsham