I do not understand why you are cribbing about the behaviour of Mumbai immigration. If you as a responsible parent forget to carry visas for your children then I do not see why you are blaming them for deporting the kids. You happen to be IT guys and I believe you should not have been stupid enough to get kids without visas. For all your bantering, what would they have done if I landed up in the USA without a visa. I guess I would find myself in Guantanamo Bay.