Husbands of Stella Alice Pickering (Anderson)

It seems Stella had two families (children) Duncan and Anderson. Stella 1880 - 1938 in Australia. Stella is my great-grandmother on my father's side of the family and I'm seeking the names of her two husbands, if this is the case because we cannot find out who is my grandfather's - father (Anderson). Stella's father was John Pickering 1848 -? and mother Alice from Wigton 1851 - ? Any info (E) patrick.anderson@batchelor.edu.au