Should I confront my mom?

So I found out months ago my mom is cheating on my dad with multiple men. She has one or two lovers she sees weekly but I think the rest are not as serious.

My dad about a year ago moved to another city for work but visits when he can. My mom is using this to her advantage and isn't very good at hiding her affairs from me. I have a toddler and newborn and she visits us multiple times a week because we have a close mother daughter relationship and she loves her grandkids to death. We always have so much fun and I've always been able to talk to her about anything but I am worried if I bring this up she will stop seeing us as much.

I know some of you will say it isn't my business and that is why I haven't confronted her yet but there are several times she sees these guys at hotel rooms before visiting me and my kids... and I also feel bad for my father. He isn't perfect but he loves her and doesn't deserve this. My husband is also very aware of what is going on and starting to feel uncomfortable about it. He used to respect her a lot but now he is constantly worrying about her touching/kissing our kids after her meet ups and if she will bring them around one of these guys one day. I don't think she would but it does bother me knowing she probably hooked up before seeing my family that day.. anyways, what would you do in this situation?

I am really torn on what to do but I feel like she will keep doing this until something bad happens to her or my family. She actually sends pics of my children and tells these guys about my family all the time! She is my mom but I feel really upset about the situation and want to confront her but I don't want her to get defensive and stop seeing my kids since they are always waiting to see her and love her so much.