If she is a tax preparer then she should know that *you* do not have to supply *any* support at all for a "Qualifying Child" dependent.
A "Qualify Relative" then yes you must pay more then half of his support but his gross income for 2020 could not be more then$4,300 or he would not qualify.
Since he a a minor child under age 18 then your problem is more of a legal issue than a tax issue, and we cannot give legal advice. I suggest that you discuss this with a family law attorney.
**Disclaimer: This post is for discussion purposes only and is NOT tax advice. The author takes no responsibility for the accuracy of any information in this post.**
