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My parents in law are Indian citizens. 

My father-in-law has a resident / green card status & was with us in the USA for > 180days in 2020.  He doesn't however have an SSN & won't apply for one (don't ask me why... huh).

My mother-in-law doesn't have her green card yet (so no SSN, of course with B2 visa status) but has an alien number (A-*) from her ongoing green card application.  She stayed with us for the full year 2020.  

Both have $0 income in the USA, both retired in India a few years ago & have less than $24k income in India.

During their USA stay; we paid for their food, insurance, medical, etc expenses.  

For 2018, with the same statuses, my CPA didn't want me to claim my father-in-law.  CPA didn't elaborate; possibly because of "no SSN".  I moved to TT for 2019 & didn't claim my father-in-law.

Questions:

1. Can I claim my father-in-law without any IRS issues?  Note no SSN for him.

2. Can I claim my mother-in-law without any IRS issues?  Note no green card yet for her.

Thanks...