Economic Impact Payment Divorced with dependent

My ex-wife claimed my son on  her 2020 taxes.  as a dependent she and he received $1,400 economic impact payments in 2021 .  I am claiming my son as a dependent for 2021.  I did not receive a payment because my wages were higher in 2020.  in 2021 my income was lower and it appears I qualify for the $1,400 payment as well as my son according to how I have input information into Turbo Tax.  is that correct that we both qualify? will my ex-wife have to repay the $1,400 she received on his behalf?  i have researched but seem to find conflicting information that he can receive $1,400 and my ex-wife wont have to pay it back as well as information saying she might