Assuming your dad's PC connects to the internet fine, there's only one test to do: connect your PC to the router with a wire.
If that works, then the issue is with the Devolo. If it doesn't, the issue is with your PC.
A bit annoying to test, but it will narrow down the problem.
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*B*
Save Early, Save Often Save Before, Save After
Two-Star General, Spelling Soldiers
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Give 'em a hug one more time. It might be the last.
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