I would just write a will with my lawyer then open a safe with a good bank to keep all my wallet details which are to be disclosed to my lawyer in the presence of my named nephews and nieces and all beneficiaries only when I am deceased. In that way, you should be able to share your profit with no kwams.
AFAIK, there is currently no law that makes it illegal for the lawyer to "steal" those coins, before or after the testator's death (this has been discussed on the forum again and again, "stealing" bitcoins has not been defined legally yet). Unless OP lives in an area where mystic wills are allowed (the will would contain the private keys), even those require three witnesses ready to testify the authenticity of that will which may be a risky proposition as those witnesses may or may not be alive/available at the time of the testator's death.
This problem can be solved by using smart contracts if there is a foolproof, non-tamperable way to digitally record one's death. I can't think of any such way other than, lets say, you not signing into your email account for more than 3 months or whatever you set it at.