She has already submitted in writing to the FRO that I should be refunded all support I have paid since my daughter left school and also the support for my son that she received since he left home
It's NOT up to them to refund you anything. SHE received the funds, SHE should give them back to you. I hope you have a copy of that letter.
I'm not trying to sound like an ass, but it's going to come out that way.
STOP RELYING ON YOUR EX TO DO THINGS FOR YOU
You feel CS should be terminated? Then take the proper steps YOURSELF.
The onus is on YOU as the payor to take the necessary steps to have support terminated.
Child support for both children should end. Neither are a child of the marriage any longer. The oldest is NO LONGER in school and just gave birth, therefore making her legally an adult and self sufficient.
The 17 year old is no longer under his mother's care and is living on his own (ergo ALSO self sufficient). As a responsible parent, I would hope you would continue to offer support and assistance to your son, but legally, your obligated to continue to officially pay CS for him arguably has ended. The divorce act essentially sets the requirement for CS as being the children are under the age of majority and still dependent on their parents.
He under the age of majority BUT is NOT LONGER dependent. You have a case to have support terminated, OR to have it directed to him instead.
Your best bet to is have your ex agree, in writing, that support for him can be directed TO him by you. Then you send her the notice of withdrawal from FRO (noted below) and have her sign it. After that, spend the extra $ to have a lawyer draw it up as a new agreement and file it with the courts. It'll save you a TON of headache and protect you from the ex "changing her mind".
For the older child, here is the process you should do:
1. Fill out a
NOTICE OF WITHDRAWAL and send it to your ex filled out and requiring ONLY her signature. Make sure you send it via R3 letter. (Registered, Receipt Required) to ensure you can prove she gets it. In with that, you write her a letter (as business like as possible) indicating that as %oldest child% is over 19, has a child of her own, and is not currently enrolled in a post secondary program, you are requesting she acknowledge that support for her has ended, and requesting her agreement to withdraw from FRO enforcement for her until such time as she is officially re-enrolled. (at which point you will agree to re-address the issue of support) Give her 10 business days to respond.
2. If she ignores you, you SCAN the form, and send her a followup email with both the form and your original letter scanned and attached, requesting a response on the matter.
3. If she IGNORES you, or does not agree, then you file a
NOTICE TO END SUPPORT with FRO, outlining your reasons as above. (Child is over the age of majority, not enrolled in post secondary and has a child of her own, ergo no longer a child of the marriage).
4. After THAT, if FRO does not allow the termination (this can take a few weeks, so make sure your FRO worker actually RECEIVES the forms and ACKNOWLEDGES THAT to you) (use the aforementioned R3 letter), you file a motion with the court to end support, asking for your costs to be covered and for the overpayment that you incurred to be returned to you by the ex (including the over payment she has already acknowledge via her letter to FRO) (if you do NOT follow the FRO process as per the above, you won't have a shot at getting your costs back)