CHEATER PARENT!!!!! UPDATE

UPDATE!!!: SINCE I NEVER DISCLOSED WHO THE CHEATER PARENT WAS, IT'S MY MOTHER!!! AND SHE'S STILL CHEATING!!! SHE HAS A CODE ON HER PHONE AND MAKES UP ANY EXCUSE NOT TO LET ME SEE IT! SO I SNEAK HER PHONE WHEN SHE LEAVES IT OPEN! SO YESTERDAY, March 14th, SHE SENT THE MAN A "HAPPY STEAK AND BLOWJOB DAY" PICTURE AND A MSG SAYING SOMETHING TO THE FACT THAT SHE'S READY TO SUCK HIS DICK AGAIN!!!! Like What the fuck!!!!! I know I should probably Mind my own business but I can't! It's my mother who's cheating on my fucking Dad Man! THEN ON TOP OF THAT HE WANTS TO REMARRY HER! THEY'VE BEEN TOGETHER FOR 26 years! I'm Still stuck on a Crossroads on whether to tell her that I know or to just tell my Dad! OH ANNNNNNNND SHE'S SEEMINGLY TRYING TO GET "COZY" with a Guy she has known since I was maybe in middle school! My mother, him, and my mother's friend went out to get lunch and I saw the msg she sent to him saying something like she enjoyed his time but she wish it was one on one basically! .... Likeeeee! Is it wrong for me to see my Mom as a "Ho" , "Whore" , whichever you choose? Cause that's not how a wife or mother is suppose to be in my opinion. HELP ME EVES PLEASE!!!!!!!!