Many good suggestions in here and thanks for the replies.
We already tried checking the computer and phone, he had a newly Samsung smartphone with a password and face-ID. It was really difficult to try and open it for many reasons. 1) The privacy of my brother and his image. After all his private stuff/secrets need to go with him with respect, this is just my view. However, I tried to open it but it was really hard with the password. I needed to hack his phone but this also was not an easy thing to do, ethically nor technically. The new smartphones are very difficult to crack open even with very good technician guys trust me.
His computer is also the same story, it had a password and I couldn't open it.
So I guess that's it, It's all gone! The issue is he moved all of his money into bitcoin, all of the money that he gathered throughout his career was put it which means his family/kids lost the man who provided for them + his money.
I did not like the idea that you must teach the family how to use bitcoin + give them the secret wors and private keys. I do not think this is a smart solution to the issue. There are many problems associated with this method which I can discuss even further but some of the people above already mentioned them. You'd be surprised at this day and age there are many people who are not really good with technology and computers, I know a man who doesn't know how to register an email. I personally can attest to this, my father isn't good with smartphones or computers, he still living in the past and it is impossible to teach him bitcoins or how to open up a private key and then transfer the bitcoins. This will be impossible. And same with my wife.
An automated way to give all heritage to the family is a must-implementation I think, just like what happens in banks. A guy dies, the court decides who inherits what and at what percentage, then you take the papers to the bank and get the money, simple as that. I'm sure if Satoshi is around he'd find a clever brilliant system to make this work.