In my case, I am not really good in terms with legal matters but if we are going to do a will that will turn over our crypto assets to someone that we choose. My concern is, is it safe to turn over our private keys to a lawyer so it can be inherited by our children if in case we will die?

Because bitcoin can be transferred easily as long as you have the keys and other details to get a full access to the wallet. Compare to the will that is being handled by fiat as most of the money are being stored in bank and it cannot be transferred easily by the lawyer.