Remember Miranda

I never met Miranda, but every day I look at her photograph, next to the telephone in the kitchen, the picture of her with her children.(P, 1)

Cathy is a girl who is going to look after the two chidrens. Thier father is not kind to her at first, but the last, he loves Cathy. I do not understand his mind. And the title is "Remember Miranda" so I thought Miranda is heroine but Cathy is heroine. If  I do not read the book, I would not know the means.

Akinymi Rowena(2001), Remember Miranda: New York. OBL