You’ll die if you lie

"And the same goes for the Demet family too, hand over Pedra Demet or your entire family will suffer"

Manuel Demet quickly stood up 

"Is that a threat, your majesty?"

"Take it however you want, you're not going to fool me by telling the servants did it"

Tatianna hadn't guessed that he was planning to punish Pedra without any concrete evidence but after seeing the turn of events, she realized that he's not going to ask any.

It was not going to be an easy decision for both Manuel Demet and Davy Lambert, for Manuel, Pedra was his sister, for Davy, Walter was his son and Walter's sons were his grandchildren. If King Hedor would have asked this, they both could have disagreed and told him to sod off but Don was not King Hedor, he was a peak level grandmaster and the woman beside him was a grandmaster too. The two of them could massacre their whole family like slaughtering piglets.