If my grandmas house is to be divided 9 ways when my stepgrandfather either sells the house or passes away until then he can remain in the house is pssible for me to get an advance for my part?

No. Assuming your grandmother has died, the only way you might be able to get money now would be if you can convince someone to buy your interest from you. Perhaps another family member would be interested. You would need to execute a quitclaim deed of your interest. If you can find a buyer you should have the transaction supervised by an attorney.