英语翻译内容是：本来打算去参加一个聚会,但是由于家里来了客人去不了了,所以写封信道歉.(人物的人称随意）先在这里谢了

Jun.16th Dear Tom, I am sorry to inform you that i wouldn't be able to attend your birthday party this weekend. My cousins came to visit me today and they intend to stay over the weekend. I am afraid that I will have to accompany them to go around the city as this is the first time they came and wouldn't be here for another year or so. I have prepared a birthday present for you and already asked Mary to bring to you on the day. I hope you will like it and wish you a very happy birthday in advance. Thank you very much for your kind understanding. Yours Sincerely, Jerry