The following information has come from the Victorian BD&Ms indexes.
Agnes Winifred Wills b 1906 Yarram, Vic d 1981 Malvern, Vic.( Reg no.04167 ) She married Alan Stanley Hearn in 1933 ( Reg no. 3136 ) He was born in Ballarat in 1905 ( Reg no.7811 )
The parents of Alan Hearn were Samuel Hearn and Janet Martin. Samuel Hearn was born in 1872 at Pitfield Plains, Vic in 1872( Reg no.18604 )and died in 1950 at Ballarat ( Reg no.16112 )
Janet Martin was born in East Ballarat in 1874 ( Reg no.13489 ) A more thorough search would find when she died.
A couple of other connections are Marion Elizabeth Wills died in 1928 a daughter of Catherine Adelia Baker.Reg no.15826 and Kathleen Adelia Wills also a daughter d 1955 Reg no.6179.
I take it that you would know when those two were born or if they had any more brothers or sisters.
The best way forward from all of this is to obtain the death certificate of Agnes Winifred Wills who died in 1981. This will list all of her children from her marriage to Alan Hearn.
If you contact the Victorian BD&Ms and quote the death cert number they will post it out to you. The same applies with all the other numbers quoted if you require them. Not exactly sure of the costs these days.
This will get you off to a flying start with your family tree.
Ian Wills ( Melbourne)