YOU SAID:
Her boyfriends mom is in love with her exlover
INTO JAPANESE
彼女のボーイフレンドのお母さんは彼女の元恋人に恋をしています
BACK INTO ENGLISH
Her boyfriend's mom is in love with her ex-girlfriend
INTO JAPANESE
彼女のボーイフレンドのお母さんは彼女の元ガールフレンドに恋をしています
BACK INTO ENGLISH
Her boyfriend's mom is in love with her ex-girlfriend
That didn't even make that much sense in English.