** Not named.3** - Adding unknown surnames

I have tried to add the children with fathers however difficult when 2 have unknow fathers who are different

(Maud, Connie and Bertha are believed to have different fathers.
Connies father named on her birth certificate as Henry Emile Halverstone.
Bertha's certifcate - fathers name blank( not confirmed possibly Work)
Maud's birth certificate - fathers name blank( not confirmed possibly Martin)

Will need DNA to confirm exactly