Narrated Abdullah ibn as-Sa'ib ibn Yazid: The Messenger of Allah ﷺ said: None of you should take the property of his brother in amusement (ie jest), nor in earnest. The narrator Sulayman said: Out of amusement and out of earnest. If anyone takes the staff of his brother, he should return it. The transmitter Ibn Bashshar did not say "Ibn Yazid, and he said: The Messenger of Allah ﷺ said.
The Prophet Muhammad ﷺ also taught us that we should treat others with kindness and respect, regardless of whether they are family members or strangers. We should never take advantage of someone else's trust by taking something from them without asking for their permission first. Doing so would be disrespectful and dishonest behavior which goes against the teachings of Islam.