will they be allowed to enter hongkong if their passports have less than 6 months validity?

I have 6 passengers going to Hongkong for a tour, 3 adults and 3 children (15/13/9 yrs old). The passport of the children are expiring on April 17, 2012 and they are leaving on Oct. 22-24, will they be allowed to enter hongkong if their passports are short of 6 days to complete the 6 months passport validity?