Deductions & credits

Sir or Madam:

Should my brother amend his first , and then when that is amended  and accepted I should amend mine after it is clear that IRS have approved amended 1040- X. 

Step 1.  Amend my brother's 2020 return.

Step 2.  Amend my own 2020 return but not until my brother's is accepted.

 

Is this correct?

Thank you,

Gary