It seems that Patricia lost custody of Misty and her brothers back when they were minors. They were adopted by their grandparents.
According to news reports, Patricia and Misty were able to reconnect two years ago and they "hit it off." Patricia reportedly told investigators that she didn't think that she was breaking any laws because she is no longer listed as a parent on her daughter's birth certificate.
News reports also note that Patricia married one of her sons back in 2008. That marriage was eventually annulled in 2010.
Of course, anti-gay culture warriors are already using this story to snipe at married gay couples.