Spotify premium is $10 here with family premium being $15 for up to $5 devices ($3/person).
You can also buy Spotify annual cards for $99 and save $20 a year.
This is not legal. You are not allowed to sell Spotify Accounts under the Spotify ToS.
Source: https://www.spotify.com/us/legal/end-user-agreement/#9-user-guidelines
Section 9.11 and 9.13
You do not know how the seller "paid" for this, but it's probably fraudulent too.
Since this is a violation of Spotify's ToS, you're definitely at risk of having the account you're allegedly supposed to get from the seller banned.
If you want a legitimate version of this to show your dad, here's a link:
https://www.amazon.com/Spotify-Annual-Gift-Card-99/dp/B07MZS4F18/