My dad bought me ed Sheeran new album on his iTunes so now we want to get it on my iPad. I have my own Apple ID account but I haven't bought any music.
How can I download the album my Dad bought to my iPad without deleting anything on it?
I think you can download it on your computer, then sync with iTunes your music by activating
Manually manage music and videos on your device's options.
That will allow you to just drag and drop music to your device without deleting anything on it.
Source: Apple Support