Parent of 19 yr old mother making bad decisions?

my daughter got pregnant at 17 my gorgeous granddaughter was born in june 08. my daughter and her boyfriend were together for almost 2 yrs and then they started fighting alot and her friends wanted to take her out for her birthday and i thought it was a good idea she hadnt been out since she was pregnant. She missed all of her senior year activities while he still hung out with his friends and did what he wanted anyway he got mad and he said he was going to take the baby to his mom's house and would bring her home by 10 that night then he called her and told her he was keeping her over night and she said ok the on Saturday she called him and told him to make sure he had her home by 11 because she had to go to work and we had somewhere to go and he told her no that he wasnt bring her home so he came to our house to get his stuff and he didnt bring her so we had to get the police involved so we could go get the baby at his house and his family does drugs and his brother in law just got out of prison and his mom even does drugs his family wont tell us the real reason his brother in law was in prison but anyway we got the baby within 2 hours and my daughter allowed the father to see the baby 3 days a week for 2 hours each day and then all of a sudden he quit coming because he said her father and i made him feel uncomfortable. he doesnt pay any child support and when he took the baby my daughter lost her job because she called into work for 2 days. so since then my husband and i have been supporting both our 19 yr old daughter our 14 yr old son and our 6 month old granddaughter completly because she hasnt been able to find a job. then out of the blue the father calls and she talks to him and now she has went with him to his mom's house with the baby 1 day last week and today she went again. we have been arguing for 2 weeks about this because we keep telling her he is no good because my husband got him a job at his place of employment so he could take care of his child and the father is going to work bragging about the sheriff coming to his house to serve him with papers for child support and his mom and sister keep telling them he doesnt live there. and we told her she should make him pay child support and then he can see her not let him see her and then he might pay. Now today she is staying over at his mom's house over night i know that they will probably get back together and i just dont want her and the baby around his family because of the back ground and him taking the baby. this isnt all that has happened but it would take too long to tell all but i need some advice i know she is an adult by law but she is not making good decisions and she told her father and i to pretty much stay out of her business and let her make her own decisions that it is her life and her baby. we have taken care of this baby since she was born financially and have also helped her parent her. i am just worried about the baby. what should i do?