Thank you Ohio for your input.

I called couple of Lawyers & I am more confused now. One of the lawyer mentioned that since it is COVID situation they can stay up to 11 months & enter before a year period. One of the other lawyer mentioned that they have to be in within 6 months time period. Personally I do not want my parents to travel at this time period as they are old & it's a lot of effort. I am still researching... will keep you guys posted. Please do the same from your end as well.

Thanks!!