2 Marriages Shown in Cenomar - Legal Beneficiary in question

My brother and his ex gf was married back in September 1997, unfortunately few years later nag hiwalay din without any annulment. My brother met his new gf and tried to get a Cenomar back in Nov 2006, to his surprise wala lumabas na record ng kasal nila ni ex gf, so in good faith nagpakasal sila ng new gf the following year February 2007.
My brother died last March 28, 2018 so my sister in law as a legal beneficiary complied with all the requirements needed for loan/benefit claims by getting NSO certificate such as Cenomar but later found out that my late brothers marriage with her ex gf and his marriage with the current wife both appeared sa Cenomar.

I just wanted to know if my sis in law still have the right over the benefits of my late brother since the woman he was married to is also now married to a different man.
How will this affect my sis-in-law's loan claims?
What are the actions we need to take from here para ma-make sure na makuha lahat ng sis in law ko yung loan proceeds sa insurance and mga death claim sa government?

mejo masalimuot po ang curcumstances ko so i need help or legal advice sana on the best course of action to take. nagkaron po aq ng live in partner then nagkaanak po kmi but during ng pagsasama nmin ilang ulit po sya nambabae at lulong sa sugal. on our 3rd child ngpilit npo aq n pkasal kmi. kumausap n po aq ng mag aayos ng papers so we can skip the seminars and such tas pupunta nlng ng huwes at pipirma kmi. kaso nabuntis ung babae nya. sobrng glit ko po kinausap ko ung fixer if pde pren maayus at maisyuhn kmi ng marriage cert khit wlng kassl n naganap. bali pjnirmhan lng nmin ung papel tas binigay sa knya sb nya pwede daw. then bingyan nya ko ng lcr copy na ginmit ko pnkot sa asawa ko pra mag ayos n sya. pero dko po inisip na legit kasi fixer lng un at wala mmn tlga kasal n naganap. that was 2010. eventually nagkahiwalay nren kmi ng asawa ko at ngkron p sya ng ibng anak sa ibat ibsng babae. ngaun nkhnp mm po aq ng mtinong lalaki at inlok aq ng kasal pumyag nmn po aq kaso nung ngaayos n kmj ng papel lumabas sa census ung kasal nmin nung una kong prtner. pero ngwan po ng praan n mkasal kmi sa pastor lng. ung ex ko me kinakasama n ding iba tas nung gysto n nila pkasal nkita din nila ung marriage cert nmin sa psa so tinuthreaten aq nung babae n sasamphn ng bigamy daw. sbi ko nmn samphn ko din sila ng concubinage saka ra9262 dun sa ex kong ndi nmn ngsustento financially sa anak nmin. anu po b ang mabuting gwin?