I'm sorry to hear of your dilemma.
First of all, the issues of child support and visitation are entirely separate and the court will not deny visitation because of arrears of support being present, I'm afraid.
As the biological father of the children he certainly have the right to petition the court for visitation---and unless he poses a danger to them, he will likely be granted visitation. You might consider asking the court to order supervised visitation, at his expense, until the children can become accustomed to him
---but unless you can prove that he poses a danger to them, he will likely prevail---I'm sorry.
I understand that you may be disappointed by the Answer you received, as it was not particularly favorable to your situation. Had I been able to provide an Answer which might have given you a successful legal outcome, it would have been my pleasure to do so.
I wish you the best in 2011.
Because I help people here, like you, for a living---this is not a hobby for me, and I sincerely XXXXX XXXXX abiding by the honor system as regards XXXXX XXXXX I wish you and your family the best in your respective futures.
Would you be so kind as to Accept my Answer so that I may be compensated for assisting you? Bonuses for greatly informative and helpful answers are very much appreciated. Thanks Again,