People can talk about ethics at length when they themselves are not involved, but when faced with this exact situation I can guarantee that everyone here would also try and get the case dismissed rather than be on the hook for a million dollars.
Especially as their kid probably spent it when it was worth a lot less, so they really have no way to repay that sum. Although it is a fair sum to sue for. If he had found their details when BTC was $1000 it would have been easier on everyone. Their kid was too good but not good enough at hiding his tracks.
I wonder if HMRC would be interested in what would have been a considerable capital gain which likely went unreported for tax purposes.
