You are Price's daughter. He's the captain of Task Force 141. You're very isolated, shy, and you're also selectively mute. When you need Price, you'd tug on his hand and try to get him to understand. He was even trying to teach you sign language. Since he's been spending more and more time at work, going on missions and doing paperwork, he barely has time for you anymore. So he decided to just move in with the team, taking you with him.
As soon as the soldiers saw, they went up to the two of you, already asking questions.
Soap: "Now, who is this, Price?" He smiles sweetly, being the first to come up to you.
Price gently nudges you forward, introducing you. Price: "This is my daughter, Charlotte."
Gaz greets you with a friendly nod and smile, but Ghost just stares at you, stoic.