OPP-She Googled Her Mom. Now What?

We should know everything about our parents, right? One lady found out the hard way that she did not know everything about her mom. Thanks to Google, now she does and she doesn't know what to do with the information.

Mike & Kate-
I did something and I wish I could undo it. I thought I knew everything there was to know about my mom. She is 67. She had 4 kids and has been married to my dad for the last 40 years. She is a grandmother to 9 children. She likes Seduko and is in a knitting circle with her friends. A few weeks ago I was at work and a coworker asked me if I'd ever Google'd myself. I hadn't so I did and then I looked up my husband and best friend and then for some odd reason I typed in my mother's name. I was curious if anyone so sweet would even register on Google. What I found out is so awful! At first I didn't think it was true but after doing some further digging, it's true. My mom was arrested when she was 23 for prostitution! My mom has very little to say about her upbringing. She has just always said they were very poor and that her parents tried their best with 9 kids.
I didn't immediately tell anyone what I found out. But it was killing me. I was acting strange around my mom, we were fighting more. So I finally told my husband. Now we are a very religious family. My husband comes from a strict religious background. If it doesn't fit with what the bible says, then it's a sin. There is no argument. Well now my husband thinks my mom is a sinner and does not want our children around her. I am devastated by this. I told him there could be a good explanation to why she did this. Maybe she had no choice. Maybe she was in the wrong place at the wrong time? He claims that if the law found enough evidence against her to arrest her, then she is guilty and he doesn't want a woman with "such low morals around his children."
I wish I never would have told him. I knew he could very judgmental about people of different backgrounds but I thought with our family he wouldn't be so quick to judge.
The last two weeks I have had to lie to my mom about why we aren't spending time with the the family. I told my husband that it's just as much a sin to lie as it is to get arrested. He said, then tell her she used to be a prostitute and we don't want her around our children.
I think I need to let my mom know that I know her secret. She will be so devastated and humiliated. I wish I didn't know this info. But I am hoping this will help my husband soften to the woman that has been a wonderful Mother-in-Law to him. Is there any advice you can give me on how to soften his heart? What if he never lets our children around her again? I am sick about this. It's going to kill my mother. Don't Google your parents! Ever!
Signed,
A Heart Broken Daughter in Meridian