The truth is that there is nobody we can trust for sure and whether outsider or not and sometimes some outsider can be more trusted than blood and relative so anyone who wants to share their secrets or details should be ready to accept whatever that may come...
Be it a stranger or not, me I no even see any reason wey I go give out my financial details like seed phrase to anybody. Because given someone such details go fit bring more enemies to you and your family. People now don sabi di kind money wey dey bitcoin investment, and dey fit be nice to you just to get your trust, and if you trust dem na once dem go change because human beings are dynamic. I don talk am before, I no go fit trust anybody with my seed phrase because it's my personal use, for me to do that if I wan render help to them, i go just open business for them and support them.
I heard of a real-life case where a new Bitcoin investor sought help from an experienced investor to start accumulation Bitcoin and the advisor helped him very faithfully. The new investor was advised to save the Bitcoin wallet security code and seed phrase in multiple places. The new investor took his advice. He was accumulating Bitcoin regularly. After two years or more, he found his wallet empty. Such a situation was an unexpected event for him. He immediately suspected the experienced investor who helped him in the initial stages of investing. When he installed the wallet, the experienced investor was aware of the security key and seed phrase and discreetly took a picture of it on his phone. Although he did not pay much attention to this at the time, he later realized that.
You should not trust anyone in financial matters. You may trust them today, but that trusted person can betray you. If the new investor who was cheated had kept his Bitcoin holdings in another wallet, he would not have had to lose that valuable asset. There is no point in suing the cheater because he did not have any. That is why no one can be trusted, especially in financial matters.