When to file I-130 and I-485

[Rganguli]

My father,84, will be visiting USA from India on July on B-2 visa that he already has. To apply for his PR, should I apply I-130 now (while he is in India) or file I-130 along with I-485 together when he is here in July? In the latter case, can he continue to stay in US beyond 6 months since his I-485 is applied?

it won’t be easy for my father to go back and live alone after his 6 months are done, so looking for best option.

[Enub4]

People traveling to the USA with a B-2 visa should not have the intention to stay on that visit. I think many just convince the parents to stay while they are visiting, others start consular processing and the parents travel just after it is approved.