What to do for a visiting nephew from India for US wedding - Visa questions!!?!?!?!

Chibiada

Registered Users (C)
I'm a US citizen. My fiancee is an Indian National. We will have a private court wedding (March) and later (Sept) a public big, catholic wedding. We want to invite his 13 y/o nephew. Our questions:

To which should we invite him to that is better odds for him to get a visa?
Which B visa does he need?
What documents will he need that shows he'll return to India and avoid US rejecting his visa?
What should I (the US citizen) write/prepare in the invitation letter?

Thanks!
 
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