My mother-in-law moved in with us a year ago, so she has been our dependent for the first time for all of 2020. She has no income and is on limited SS so she did not do taxes last year. She just submitted taxes this year and she filed that she is dependent. Her tax return was accepted. I tried to file our taxes but they were rejected with the reason being that we claimed her as a dependent when here last tax retun filed (2018) did not list her as our dependent. How long should I wait to e-file again so that her filing as our dependent is registered?
