Visitor visa etension question - important

[brviju]

1. What would be the repercussion if we apply for extension for parents only 11 days before the authorized stay expires in this case Dec 31 2010?
   
2. What is a valid reason and duration for extension? My dad wants to spend time with other family memebrs in East (nephew) coast and west coast his brother). Is this a valid reason?

[immihelp]

1. That's fine.
2. Valid reason for extending tourist visa - More tourism.