I know that Sv things travels through the house fast. My son's friends family had it this way: twins got it Thursday, dad got it Saturday, mom got it Monday and other brother got it Tuesday. I think by tomorrow you are free and clear. By tonight you should be, but for safety sake, say tomorrow. I think you can rest a bit better especially knowing that your MIL is cleaning the worst part up. Also, he only V*'d for an hour, so even though it was rough for an hour, it sounds likeyou could eek through that with just D* if you got it.
I am thinking about you and I know you will worry, but try and calm down so that your immune system isn't wacked out over this.
TRY to live each day like it were your last