Early Distribution From Estate

[GolCo]

My sole surviving parent recently passed away (2 months ago) leaving my sibling and I roughly $1.5m in stocks and misc. We are the only two heirs and my sibling is the executor.

My question is how to obtain early distribution. Taxes have been filed and we are waiting for the IRS to respond. We anticipate very minor tax obligations from that filing.

What is required to to accelerate this process? My urgency is not the need for money, but is based on the current stock market situation and not being able to control the assets while they waste in limbo.

Is there an option for distributing the main percentage and keeping a partial fund for taxes or bills that might come later? Is this commonplace? Should we get attorney's involved or do this ourselves?

Thank you