You just received 13+ answers when you asked this question two hours ago. What is wrong? Do you not like the answers? You seem to be laughing at this after quite a few decent people answered your question and told you to stay away from your mother-in-law; and now you say she's "hot" and "it's getting harder to ignore her." Do you know what? YOU, mister, are a CREEP and don't deserve our time here on Ask.com.
Don't allow any opportunity for her to be alone with you. If she openly flirts around others (like her daughter, husband) they will notice and hopefully speak with her in private. If you confront her and you are wrong it could cause hurt feelings or worse.
Saying that she is hot is rather disgusting. You shouldn't even think that. You're wife loves you and you think her mom is hot? Questions like this are unreasonable. Stay away from your mother in law and stop being sick minded.
You know, your mother in law could be testing you. Many your wife actually knows about it and is waiting to see if you will be faithful.. It's just an idea. But I would say to just stat away from her. Your wife would probably never forgive you if you cheated on her with her own mother.
Have sex with her. Destroy your marriage; destroy your wife's relationship with her mother; destroy your mother in law's marriage to her husband, and if there are kids involved - completely mess up their lives while your at it. (What do YOU think you do...? Keep your distance! Jeez.)
First off. DONT LISTEN TO DAVID. Tell your wife, you and her can think of ideas on whats best. Maybe even she could sit behind a wall, you and your mother-in-law get get alone and your wife can hear what she says and how she says it.