I have Mom living with us and was wondering if I am eligible to file for POA?

Agree with the above information by Pam & GA. Also want to gently point out, being the oldest or retired are not the qualifications for being the POA. Your Mom gets to choose her POA, and she alone can change it (as long as she's competent). The other siblings MUST respect mom's choice. If you wish to challenge mom's choice, and possibly become Guardian for your mom, you must be prepared to pay a lawyer out of your own pocket, and be able to convince a judge why you are better than the POA, and in addition, better than a non-related 3rd party professional Guardian-- in other words, you could spend thousands challenging your mom's choice and wind up not becoming Guardian but instead having the judge award your mom's care to someone completely outside the family! So, carefully consider the options. Maybe you should work things out with your sister so that your concerns for your mom are addressed. This is all about mom--not you, not siblings. JUST mom.

Who was "awarded" POA? Did a Judge assign this award? If so, any changes have to back before that Judge, including decisions about where she lives. I think what you are referring to is Guardianship.

Your profile states that your mother has dementia or Alzheimers. Unfortunately, people with those diagnoses are not considered mentally capable of executing or changing legal documents, so your mother can't sign a DPOA or other document with that diagnosis.

Unfortunately, I see a dispute arising between the Puerto Rican sister and you over where your mother should reside.