My wife [40s F] and I [40s M] are both seeing other people but choose to stay together regardless. Our oldest child [29 F] is very angry at us for this and fighting with our other children [25 M and 21 F] about the situation.

This is my first post on Dating.mobi and I hope I am doing this right. Please let me know if there is something I need to fix. I hope that this website can provide a more diverse range of opinions than my family and friends can.
My wife, Marge, and I were high school sweethearts and we have been married for over 25 years. We have three adult children: Lisa [29], Bart [25], and Maggie [21]. Lisa and Bart live on their own and Maggie is still in college.
Life has generally been good and we have never wanted for anything, but I would be lying if I said that the spark had not died down during the past decade. Despite this, Marge and I are still very close and we never fight with each other. I don't know if you would describe our relationship as one with romantic love or sexual intimacy, but we are both very much connected to each other and I couldn't imagine spending my life with anyone else.
Neither one of us is quite sure how this happened, but during the past 4-5 years, we have both been seeing other people. This will sound very odd to most people, but we had never made any effort to hide the fact that we were seeing another person. It was like one day, we both realized what was happening and we both started laughing about it. Marge knows that I am seeing several different men and women and I know that she has her boyfriends. We're both comfortable with this and we encourage each other to have fun and be happy.
Despite our best efforts to keep this a secret, our children found out. My wife accidentally left her email account logged in on Maggie's iPad and Maggie went through her emails and printed out all of the private conversations between Marge and her boyfriends to give to me. Maggie and I had a long talk about the situation and I explained to her that not only was I aware of her mother's actions, but that I supported her mother 100% and that it was a mutual agreement between us. After my wife confirmed that it was true, Maggie said that she understood and would support us doing whatever made us happy. Our son Bart had a similar reaction and is fine with the situation as long as we are both happy.
Unfortunately, Lisa has not been nearly as open minded as Maggie and Bart have been. Lisa has been calling my wife and crying on the phone to her, begging for her to leave me. Lisa does not believe that an open relationship can exist and she believes that I am manipulating Marge into staying with me. It has gotten to the point where my wife is tired of explaining the situation and has begun hanging up the phone whenever Lisa brings the subject up. Lisa has tried to get her siblings on her side, but neither Bart nor Maggie want anything to do with her after some of the posts she made online about us. Maggie and Lisa also got into a screaming match about the situation and Lisa banned Maggie from her house until further notice.
The holidays are coming up soon and I don't know if there's a way to fix this and make our family whole again. I've started to lose hope that Lisa will ever come around and accept the situation for what it is. I love my daughter with all my heart and I don't want to lose her over this.

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tl;dr: Wife and I have been married for over 25 years and have an open relationship. Our adult children found out and our oldest daughter is not taking it well, believing that open relationships can't exist and claiming that I manipulated my wife. Our youngest two children are angry at the oldest for not being happy for us. I love all of my children and I don't know what to do to fix this.


Source.

Looks like you got yourself into a sticky situation here . If you really love your children you'll have sit down with them and communicate your situations and try to work out a formula to compromise n coexist .

If it works for you then do it.

Life's too short. as long as no-one gets hurt then what the hell.