Dear BOB,
We want to help you. Your father should provide us with the following information in private message so our team can resolve this situation as soon as possible:
1. The exact name of Clan, its tag and his name in the game.
2. The receipts of purchases made on his lost account. To find the purchase history, please follow the steps described here:
- for Google Play https://support.google.com/googleplay/answer/2850369
- for iTunes https://support.apple.com/en-us/HT204088
3. Specify the approximate amount of Gold left on his lost account.
This data will help us to make sure that this account belongs to your father.