I claimed all 3 children in 2019 and I file single. My ex and I have to take turns each year with my oldest son so 2020 would be his turn. I didn't work enough in 2020 so my boyfriend claimed our two other children this year. I received both the first and second stimulus based off 2019 taxes. I filed 2020 thinking I had to use the child tax credit with my oldest son and was wrong. I can't since his father most likely already did. I need to amend my return but also don't want the IRS to use 2020 due to my mess up. Will they still use 2019 since I have to amend 2020's? We are struggling and the stimulus has helped and now I could have screwed it up. Help!
