I live in Canada and i am a Canadian citizen. my ex who is also a Canadian citizen is living in the USA in Idaho. I was paying child support until 2 months ago when my child moved home to Canada to live with me permanently. my ex has refused to pay any child support what so ever and given the excuse that i did not pay American exchange rate on my support payments and is also claiming i am now responsible for 1/2 of the medical expenses incurred by our two daughters over the past 7 years. she claims if i pursue child support payments she will sue me for the medical expenses and back child support as she claims she could have gotten far more than was agreed to and ordered by the Canadian courts...is this something she can do.