Parents Travelling to US seperately

[Subhanat]

My Parents got their visitor visa in Oct 2006.My mom is planning to travel next month to visit us and my dad is planning to come a few months later ( because of official reasons).My question is if there is any problem in my parents travelling seperately and is there anything to be explained at the port of entry.

Thanks for replying

[Murali]

No problem at all.
A valid visa is good enough to travel, travelling alone or together its a personal choice and immigration authroties has no objection on such things.
Good luck !