Proviso under Section 10 (2) reads as under:
Provided that where more than one registered persons are having the same Permanent Account Number (issued under the Income-tax Act, 1961) (43 of 1961) , the registered person shall not be eligible to opt for the scheme under sub-section (1) unless all such registered persons opt to pay tax under that sub-section.
Proviso u/s 10 (2A) reads as follows:
Provided that where more than one registered person are having the same Permanent Account Number issued under the Income-tax Act, 1961 (43 of 1961.), the registered person shall not be eligible to opt for the scheme under this sub-section unless all such registered persons opt to pay tax under this sub-section.
So, answer to your question in post as serial number 3 is NO, same is not possible.
These are ex facie views of mine and the same should not be construed as professional advice / suggestion.