HELP-Studio Lighting Over Exposure Pictures Included

HELP ME PLEASE! -----also posted under studio forum
I am starting to go crazy. I am new to studio photography and am having trouble with my set up.
Here are the specs on the lights:
A Master/Slave Flash
A Slave Flash
7 ft Light Stands
Two 32" umbrellas (Silver/White)
The Master strobe has a guide number of 55 (Main light) and the slave strobe 42 (Fill light).

I have posted a picture of my set up.

My pictures have a very hard bleak, deer in headlights look to them.
The specs on the picture of my not impressed husband and daughter:
1/125
4.0
ISo100
Auto White balance
Canon Rebel EOS Digital

If anyone can give me pointers it would be appreciated.