How many one person can sponsor for B2 Visa

[pm2009]

I'm a green card holder and been here for a long time and hardly got chance to visit india.

I'm planning to send sponsor documents to couple of my close relatives so they can apply for B2 Visa and visit me
I would like to know is there any limitation on how many can be sponsored by an individual person?

Also while sponsoring for school going kid (elementary school) are the documents same as in immihelp or different?

Any help in this regard will be appreciated

[JStone]

If you are financially good enough to support, there should be no problem sponsoring multiple persons and I feel documents would be same for all those you are going to sponsor.