Beautiful rats!! Cute photo...
I like 'Teils too, but about them being noisy... My mom owns a female named Cookie, and she is the noisiest bird I know... she's completely alone, but loves to coo, scream and screech. She is spoiled, so we all assume her racket is just begging for attention... She is NOT quiet at all!! LOL
Like I said previously, I think a cute box turtle, or a smaller species of tortoise would work well in this situation, considering all the factors...
I hope this girl and her father can come to terms and compromise on a pet they'll both enjoy... =)