Can I claim my parents as dependent?

Here's my unique situation with my parents that makes this tricky:

- My parents came to the US in 4/2023 as tourist visa

- My sister sponsor them for green card in 7/2023.

- I applied CoveredCA for them (only them as my family have separate insurance) under my name starting 7/2023 till the rest of the year w/o any ATPC

- They stayed with me pretty much since April

- They don't have any income

 

Question I have:

- For tax purposes, can I claim them as my dependent?  I'm not clear if they're considered as US resident or not.

- Can I claim their medical bill I paid for them if they're not my dependent?

- If I can't claim them as my dependent, what do I do w/ the 1095A file that I received since it's under my name?