John Blatchford Mollard and family lookup?

I'm hoping someone will be able to help me with some information on
John Blatchford Mollard & family. Here is the information I do know...

John Blatchford Mollard married Elizabeth Jackman (she was born c 1817
and died 1892 in Victoria Australia.)

I have the most information on the eldest child as he is my gg
grandfather, but I only have names for the other siblings

*Francis Mollard (Born 1841 Peter tavy, Devon, died 1896 (in Australia)
married Emmeline Goodman in Tavistock.)
*Mary Ann Mollard
*William Mollard
*Caroline Mollard
*Betsy Mollard
*William Mollard
*Eliza Ann Mollard (born 1853 Tavistock, died 1913 Australia married
James Webb in Tavistock)
*John Mollard (born 1856 Tavistock, died 1910 Australia married Sophia
Jane Samels Cornish in New Zealand)
*William Henry Mollard (born Tavistock)
*Frederick Jackman Mollard (married Louisa Barnes, I think he may have
been in the reserves)

If anyone can help me with any information on this family I'd be
grateful. Apart from wanting to follow up on Francis' brother's and
sisters, John Blatchford Mollard is currently the earliest Mollard I
have record of, and I would love to go back furthur if possible!