Trying to sell my house

my mother passed away almost three years ago. i am the executix. the deeds of the house are in my name and i live there. in the will it states "I leave, devise and bequeath my dwelling house (address) to the said (my name) upon event of sale 50% of proceeds goes to (my name) 25% to (my bother) and 25% to (my sister). I have applied to sell my house and it has almost gone through my sister agrees with it but my bother is now trying to stop it (because he reckons the price is to low) my question is can he do anything about this or can i just go ahead with the sale of the house? also all of the stuff in the house is that mine or do i have to share it with them? (tv ect)