Upcoming shoot with my daughters - need some portable lighting

I am planning a serious photo shoot with my daughters in a month or so.

This is a room in the Nottoway Plantation I shot last week. I've done talked to them about shooting in this room with my daughters and it is OK, I just can't bring in huge equipment (that I don't have anyway). I will be using a soft box over my speed lite, but I want a couple small, battery powered lights to help curb any shadows. I am thinking something along the lines of a powerful flashlight with a soft box on them. Is there something like this or something I could make?

Edit - photos added

Here are some test shots I took of the room today. I set a custom white balance to the wall of #'s 1,3, & 4. #2 was the other end of the room, so the WB is a little off. These were taken at high noon. The windows are East #1,3, & 4/West #2

IMAGE LINK: http://www.flickr.com …eantiquetiger/8​747390651/

IMAGE LINK: http://www.flickr.com …eantiquetiger/8​748512658/

IMAGE LINK: http://www.flickr.com …eantiquetiger/8​748512192/

IMAGE LINK: http://www.flickr.com …eantiquetiger/8​747389453/

Well, I didn't get any replies yet, so I went shopping.

I bought two of these. Anyone use these? Worth a damn? I check their website, they are sold out, so I had to buy on ebay.

Check here:
Lighting & Flash

IMAGE LINK: http://dx.com …e=affiliate&cat​egory=1510

Since everything is white, your one speedlight should do the trick. Just turn it and bounce it behind you, up where the ceiling and wall meet and that will reflect and light up the entire room with soft light.

Since that isn't your image, IMAGE POSTING RULES only allow you to post a link to it.

Images added to original post