During times of asset transition (like probate) it is wise to "park" money in super safe investment vehicles to preserve their current worth. The name of the game is to minimize risk but to still collect some investment interest especially if the money is going to be held for any length of time. Asset categories that make sense range from standard bank accounts, to CDs and even a high interest rate certificate of deposit if there is a reasonable goal to increase the value of the assets.
You will likely want to stay away from any asset that isn't liquid or that has a maturity date significantly beyond the likely time frame when the money will be needed or transitioned to a new owner. Again, be smart with the money, avoid risk and avoid locking it up for extended periods of time.
