As Doggie stated so eloquently, if your son adopts the daughter of his ex, she will no longer be the daughter of his ex. He can only adopt while married to her mom, for mom to be a parent also.
As Doggie stated so eloquently, if your son adopts the daughter of his ex, she will no longer be the daughter of his ex. He can only adopt while married to her mom, for mom to be a parent also.