I am a Naturalized US Citizen, and so is my Wife.
My parents are Indian citizens and aged 85 and 80 years. They have never visited the US.
I have one estranged sibling (brother), who is an estranged son to my parents as well.
I had applied for their immigration visa, but could not proceed with complying to queries raised, relating to their Marriage Certificate. They don't have one; nor is there any way for us to comply with the alternatives. So I had to abandon the process mid-way.
They are pretty old, and will not culturally be able to settle down in a different country at this stage. So I wanted them to visit me whenever possible, apart from me visiting them. My only intent to file for their immigration visa was because, I was told that, me being an US Citizen, they would in all probability be denied a Visitor visa, since they would be categorized as "intent to immigrate". So though they didn't have any intent of settling down here, just to avoid being denied a Visitor visa, I had filed for their Green card (which of course I had to stop now as mentioned above).
My question is:
Is there any way they can file for their Visitor visa, given the background above, and not be rejected?
What precautions / considerations / steps should they/we take to ensure that?