My 7 and 10 year old are supposed to go with their father every-other weekend, but he is very inconsistent at picking them up. Sometimes he goes months without getting them, and then when he gets them he calls me constantly because the 7 year old does not listen to him or his wife. The last time they went there his wife used curse words to refer to him while his father was talking to me, and my child standing there. She has threaten to leave him if my child comes over again, so their father said he cannot come back, but they want the 10-year old to come. She placed him in storage room because they did not want to deal with him. IN addition she has slander my name and my children on Facebook. She has also called me bad words infront of them. He has not paid since April, 2009. What can I do?