Grandma unglued?

I got a call from a young lady's Mother saying her daugher is pregnant by son. I did take them to planned parenthood and got a pregnancy test. She was in fact pregnant. The mother was exstatic about it. Her first responce was, " I knew it." "Now we can get more WIC and foodstamps." This discussed me so much. Not because I thought the young lady was bad or anything, in fact I really liked (Her). I was upset because they were too young. I realized as her mother spoke that this was a set-up. The mother gave me too much details about the night her daughter and my son had for the first time. What 17yr old would tell every detail unless mother was teaching her some bad stuff. I believe mom prostituted the girl for more welfare. As time went on I discovered I was right. My son admitted to me that durning the time when he ran away, he was inside this woman's house when I would stop by looking for him and asking questions. they won't give a DNA test or allow me to see the baby