Nobody is interested in your ratings
The rule that the beneficiary and witness cannot be the same person does NOT apply to Hindus
Instead of a settlement deed, you can also explore a conditional gift deed which will immediately transfer the 66% share of your parents in your favour
The condition in the gift deed would be to the effect that so long as the parents are living they are entitled to reside in the flat despite the transfer of their shares to the son by gift
So if the 66% share is transferred in the lifetime of the parents only then that will avoid any future issues
Your brother can sign on the gift deed as a witness so that he cannot challenge the gift deed in future on the ground that it was made to be signed by the donor under some undue influence or misrepresentation
The registration formalities of gift deed on your behalf can be done by a POA holder appointed by you
I dont understand if people already have certain 'understanding' of a matter and they are so sure about it then why do they even ask queries. Your understanding that the witness and beneficiary cannot be the same person must be from some google search and NOT from the Indian Succession Act, 1925. I could have shared and explained that entire provision which excludes that rule for Hindus but I really dont want to waste my time when people have some fixed understanding of the matter.