Hi
You can use Family Search.org
also IOMFHS click on research on the right hand side

I have keyed in Margaret Alice Cowin on Family Search
It came up with one born Santon 1869 to
John Cowin and Margaret which ties in with your info

On the bottom of the page it gives batch no's
if you click on the batch no it will bring up another page
type in the name of the father and mother then(enter)
it will bring up other children born to these parents

in this case All born Santon
JANE COWIN 13/5/1866
JOHN 06/10/1867
MARGARET ALICE 07/03/1869
ROBERT 26/05/1872
ELIZABETH ANNE 30/08/1874

I don't know if you already know this
but I thought I would share what little knowldge I have

Best of Luck
Lesley