My 9 yr old doesn't seem to care about anything and lies constantly.  He started his lying a year ago and it was only about his school work.  He would say he finished his homework at school and not bring anything home.  His grades then went way down to the point he ended up having to go to summer school.  Through the summer his lying went away.  Now at the end of the 4th grade school year, he started his lying again and has been hiding homework, which he said was completed but wasn't and has been hiding his report card and any other papers regarding his behavior at school.  I have punished him with everything I can imagine.  Spanking, grounding, taking away all privaliges and even the big blow of taking him off his baseball team.  He just doesn't seem to care about his school work or his lying.  I have talked to him till I am blue in the face and he tells me he will quit lying and do his school work, but he reverts back to doing nothing.  He has now started lying about things other than shcool work.  His mother and I have been divorced since he was 2 and she has remarried and divorced twice since then.  I have been re married and now have three addtional children.  I get to have my son two nights a week for three hours and every other weekend.  She seems to care about all this but doesn't spend much time with him, and dumps him off on his grandmother.  His mother tells him to do his homework and never checks to see if he is doing it.  I have talked to her, but she says she is doing all she can, but I don't think she is.   Whenever I ask him what he is feeling or thinking the response is always "I don't know" or "Nothing".  He has never once opened up and told me about any problems he is having or how he feels inside.  I am worried he is so bottled up that now he doesn't know how he feels.  How can I get him to open up and to quit lying