possessives - "My and my sister, Anna Smith's records" or "My and my sister's, Anna Smith, records."

I'm writing a request letter to my and my sister's high school but I don't how to properly say it.

I, Rebecca Smith, would like to request a copy of my and my sister, Anna Smith's Transcript of Records.

or

I,Rebecca Smith, would like to request a copy of my and my sister's, Anna Smith, Transcript of Records.

if both are wrong, please tell me a better sentence and also, if something is wrong in this question, you can correct it.
Thank you very much