We are 7 brothers and sisters who have inherited a house that we want to keep but 2 of my brothers do not want to and we plan to give them their share with out selling the house. The house is valued by real state specialists to be 700,000 SR, and our 2 brothers brought a buyer for the house for 800,000 SR. Question: Shall we give them their shares based on the 800,000 value? The new buyer does not know about real state values and he just wants to buy the house. Second question: Is it Ok to have one of the inheritors buys the house with more than the original specialists' value, so that he can keep it for himself?

Praise be to Allah, the Lord of the World; and may His blessings and peace be upon our Prophet Muhammad and upon all his Family and Companions.

If you want to keep the house in your possession and there are some partners who wish to sell it in order to get their portion of the price as mentioned, then they have the right to demand their portion from the paid value (i.e. 800,000), not from the other estimation, i.e. 700,000.
Allah knows best.