HELP ME!!! Really conflicted and confused!!!

If anyone could give me some advice I would greatly appreciate it . Ive recently come out to myself as bisexual an feeling very conflicted. Its something i've known for most of my life but just didnt know how to handle. I'll start with 3 months ago: I'm a very intuitive person, and it's recently come to my attention that my sister in law who I am close with, is a lesbian but in the closet. After a night of drinking she sort of attempted to tell all but eventually trailed off into another conversation. Since then, I suspect that she is in fact well aware of what she said that night but doesn't know how to go about it. Being that we are close, of course I became sympathetic about it and wrecked my brain about aproaching her without freaking her out. I still haven't talked to her about it, however I have realized that I'm identifying myself with her. Wanting to come out but not knowing how you family and friends will deal with it is such an overwhelming feeling. When I was 18, I figured that maybe it was curiousity nagging at the back of my mind. Yet before I knew it, I met my now husband, fell in love and now here we are 6 years later with 3 beautiful kids. And I love my husband, I know he's the only man for me. But I also know that like women as well but have no intention of cheating. What I really want to know is where do I go from here? Do I tell my husband about my bisexuality? I realize that if I do, I may be adding stress to his list of insecurities. Like I said before, I have no intention of cheating on my husband. But a part of me feels like I'm lying to my husband and it's sort of eating away at me. And my sister in law, do I tell her as well? I'm not worried about her telling anyone but I do want her to know that I understand where she's coming from. Please help!!!