Le mère de mon pére est la _________ pour ma mére

The question (after decoding HTML entities) asks: 'The mother of my father is the _________ for my mother.' In French, 'belle-mère' can mean both mother-in-law and stepmother. The mother of your father is your grandmother, making her your mother's mother-in-law, hence 'belle-mère'. Grand-mère means grandmother, mère means mother, and fille means daughter.