What happens when 3 people own a house and 1 wants to do something the other 2 do not approve of?

Question Details: I live with my girlfriend and her 2 brothers. It's a house that is all paid off and ownership is evenly split amongst them. One brother has a wife and 2 kids there. The other brother had a wife and 2 kids there but they got divorced so his wife moved out. The 2 kids live there when it is his turn to watch them. He wants to move to TX and leave one of his girls at the house to live. He wants to move his ex-wife back in so she can watch her. My girlfriend and he other brother do not want this, as she's not liked by anyone in the house. Is there anything they can say or do to prevent her from moving back in?

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