It's sad that the son killed his father just because of money.
I'm sure the father has all the trust for the son, but his son knowing the father has the bitcoin stored on his phone was probably tempted to steal it. Nowadays, it's hard to trust anyone even your family, so it's better to keep silent about your holding and make sure you don't store in an online wallet if we are speaking of a huge amount of money already.
What disturbed me more here is the Son willing to kill the father just for the money, not the bitcoin stolen by the son.
Weel, you got that right. When it comes to money, I believe it is to trust no one, we have heard many stories about couples betraying each other because of money and here we are again, a son killing his own father because he wants to steal his Bitcoins but would it have mattered if the father stored them in a hardware wallet? cos I think the same way the son had access to the phone wallet he might as well be able to have access to that too, it is just a sad story.