After listening to Anders' sudden monologue, he didn't understand everything, but he considered any further words unnecessary. He walked up to his brother, put an arm around him, and patted him on the back. It was clear that he, being an introverted person, had been holding all of this inside for ages, and could have continued to do so, but today's events had finally broken through that shell and allowed a bit of common sense to emerge.
He looked silently at the cat – just an ordinary stray, nothing more – and didn't comment on its unusual behavior. If Anders had mustered the courage to say everything as it was, then he was already moving in the right direction, a direction worthy of a man – towards recognizing his own will as the main driving force in his life. As long as that's the case, he needs to believe in his brother and give him the opportunity to resolve this situation on his own. But if it turns out that the cat is harboring vile intentions or pushing its owner towards ruin, then it will die like any other beast – in this sense, demon animals are not particularly special, except that souvenirs with mystical power can be made from their body parts.
Added 17 minutes later
– We won't find our sister if we just stand here... Let's move.
I believe everyone now knows everything; the rest can be discussed later, if there is anything else.