My client in 2018 claim his kids and his girlfriends(mother of his kids).In 2019 My client claim the kids without  the girlfriend. In 2020 he would like to claim kids and the mother of the kids, but she already received the 3erd stimulus check. If I file client's taxes with the Girlfriends, she should return the 3erd stimulus check? 

I read IRS web " Generally, anyone who is a US Citizen, or U.S. resident alien is eligible. You will get the full amount of the 3erd Economic impact payment if you (and your spouse if filing a joint return) are not a dependent of another, have a valid social security number....SO, most tax preparer said that everybody will received the stimulus check, I'm confused. Thank you!