用英语翻译一个中文句子

"My parents travel in order to come back next month"

my parents go on errands and they will come back next month .
go on errands =go on business出差

my parents wont come back until next month for they went on errands.

My parents are on business and they won't be back until next month.

My parents are on business and they will be back next month.

My parents have gone for a business trip and will be back the next month.