You have a right to know where your boys are staying.
Be strong, and resolute, first and foremost. Even if you have to fake it. Be assertive and stand up for yourself. Be matter of fact, nice and cordial...as long as she is. Do not show weakness. Do not let her walk on you. I wouldn't show anger either. I can't emphasize enough how important it is for you to adopt robx's approach and heed his advice.
Good luck
"Always go straight forward, and if you meet the devil, cut him in two and go between the pieces." - William Sturgis, clipper ship captain, 1830's.
