问我很抱歉不能来参加你的生日聚会，因为我妈妈在骑自行车上班途中摔倒，正在住院治疗，我爸爸因为公事到北京出差，三天后才能回来，我需要照顾母亲… 英文翻译

I'm sorry can not come to your birthday party, because my mother fell in his way to work riding a bicycle, is in the hospital, my father as official business trip to Beijing, three days later to come back, I need to take care of mother 。好了