Claiming Social Security Benefits Can An Ex-wife Claim Social Security Benefits If She Re-married?

Can an Ex-wife claim social security benefits if she re-married? - claiming social security benefits

I take care of an elderly woman, and she seems to think that when social security benefits could to get an ex-husband, even if remarried.
She married her ex-husband of 20 years if she is divorced, then married 5 years later and has worked with him for 20 years. Her second husband died and now ex-husband remarried several years. I know that women today can take their services to complete, but my mother seems to think they can too.