Dad and his female "friends"

Ok so sis hates our oldest brothers girlfriend. She is sure that Sharrie is trying to put the moves on my dad right under my mom's nose.Doesn't help that she is almost as old as my mom and my brother is only 45. Here are her reasons for disliking her. I not sure what to think.
1) Either she or dad call and talk to each other at least twice a week
2) She is really touch feelly around dad
3) she is always calling dad to complain about my brother her newest one was to tell my dad she tought myt brother was gay ( What Place Is That Of Her's To Tell My Dad Something Like That?) Not sure if it is true or not and do not care. It reall upset him bad(dad)
4) she went into the hospital for high blood pressure and my dad zoomed right up there to check up on her.
That is just a few things.
Sis has been on mom about it alot lately. (I am the peace keeper.)
I understand sis's point I do not think there relationship is right either Sharrie and my dad's but what can we do about it?
Mom says yah she is uncomfortable around Sharrie but what can she do about it? She even told my dad so she says that Sharrie and him talkingas much s they do is not right.
I recently found out dad has always had (female) "friends" that took presidents in his life over evryone else in heis life but mom says no waythey are sleeping together because of dad's health problem. But yet he treats these women as his partners and the rest of us like shit when he has one of these friends. The last ones name was Patty mom divorced him over it but they remarried a year later when Patty was out of the picture. I guesss there have been several others that mom hadf already delt with in the relationship. The weird thing is that Dad holds the divorce over Mom's head when he was the one in the wrong but he says he was doing nothing wrong.
I want to finally aproach this situation but not sure if I should or how. What is your take on this?

 

it's for your mother and father to work out. In other words, it's not your place, nor is it your sister's place, to say or do anything. If your mother will not or can not do anything about such obviously wrong relationships between her husband and other women (it doesn't matter if he's having sex with them or not) nothing you can do or say will change that. She's gonna have to hit rock bottom before she starts the long climb up out of the hole she's dug for herself. It hurts to not be able to help, but there's nothing you can do. Just let her know that you'll be there for her whenever she needs you.

 

I kinda figure someone would say this Mamaboogie but it is almost like they expect me to call up Sharrie and say back off my daddy Bitch. You know? My brother J really doesn't seem to notice other then he has an I can give a shit less attitude. I just don't understand why Daddy needs these friends? Mom treats him so good dinner on the table by 6:30 each night, Works full time so he can stay retired, always cared for the family, supports him in most anything he does except this and with most things she is out and out blarently honest with him. Daddy is kinda an ass he talks to us all like we are red headed step children or scum. He is just one of those mean hatefull people like his mama except to these women.

 

stay the heck out of it .. you don't know how A) your dads going to react B) your mom C) Sherrie D) your Bro) i know its hard but if you have confused feelings about this whole issue write it in a journal

 

I consider that emotional cheating even if he isn't sleeping with these women. I hope your parents can work it out, but I think the others are right: you should stay out of it...

However, I know from experience that's a LOT easier said than done.