I'm Doug, and I'm very sorry to hear of your situation. My goal is to provide you with excellent service today.
Actually, not, it is not reasonable that he cease all child support---or have you reimburse him for all child support during this time. You are not modifying legal custody of your daughter here which would make a difference.
Instead you are allowing him to have a greater period of visitation
. You still must pay to maintain the home that you and your daughter live in, and the things that you are not going to have to cover---food and perhaps some clothes---are about the extent of his out of pocket costs.
You might extend an olive branch and agree to reimburse some portion of the child support if you want to be noble---or you can tell him that you won' reimburse any of the support, and that it is his choice to have her with him longer than usual, not yours.
And yes, you can seek reimbursement of the 90% of unpaid expensed owed by him, even from years ago. You would do that by filing a Motion for Contempt and Enforcement against him.
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I wish you the best in 2013,