求一篇英文道歉信！内容是关于妈妈生病了不能去帮朋友过生日！

Dear XXX
Heard your birthday is near, Im so happy for you. Bad news i couldn't go and celebrate with you, because my mom is very sick, i have to stay at home and take care of her. I will make it up to you when my mom gets better. Anyway, have a lovely birthday.

Best wishes
Love
XXX