I hope you pay me for this advise.
Forget about what has passed and do it like this.
Set up a company...Ok I know it unafrican or something but setup a company with all the property included in the company.
Set it up with equal shares or shares that you have agreed to start with.
Of course running something like this takes time and effort. Some fellows shan't work...Just come to ask for their money back.
Especially when it fails, they'll be the first ones to post on facebook how you scammed them.
So and this is not only for a situation like the above but also for startups.
Use this formula...It works wonders.
I personally I'm getting rid of all my projects where the partners aren't willing to go with it.
http://slicingpie.com/
Family can be stressful so quickly form a company setup as per the wishes of the deceased. Then run it in the pie model. That's my humble opinion. It's free and lawyers shall take 30% of that 100 million.
Thieves are not good people. Tumeelewana?