Answer: Grandpa: 60 Granddaughter: 6
Explanation: When I first saw this, I noticed you can not get one solid whole number with a number like 54, so I rounded it up to 60, because 10 percent of 60 is 6. It IS possible for someone to be 5.4, but with age, not a lot of people care to go down to the decimal point. I then checked the other part. 60 IS 54 years more than 6, so 60 is correct.
Commit self deletus means to "delete yourself" AKA killing yourself
The Narrator is also not from "here' either. I hope this helped enjoy the rest of your day
Because then the Germans would have used a different secret code.
