Check your 1040, did you check the box? On the 1040 check the Standard Deduction section under your name and address. There is a checkbox if someone can claim you or your spouse.
This year they will have to mail their return to claim you. You need to amend yours. They don't have to wait for your Amended return to process.
How to Amend this year
https://ttlc.intuit.com/turbotax-support/en-us/help-article/tax-return/amend-federal-tax-return-current-year/L7eS6o1qh_US_en_US