Family Visitor - How soon can they revisit

[mistryb]

Hi, my family has just reurned back to India. They were here on Family Visitor visa. I want to know how soon can I invite them back again?
Is there any dry period that they have to be out of the UK for?

UKBA advice line is always packed and would buy a lotto if i can get through...

Any advice and rediection to official info source will be hugely apprecited

[Lucapooka]

Depends on how long they stayed in the UK. The general rule is that visitors should not accumulate more than six months in any given yearly cycle. Why do they need to return so soon? If it's good reason they can apply for a visa, but if they simple prefer living in the UK (as visitors) they could find it difficult.