My brother have split up. They own a house jointly, they

Hi, My brother have split up. They own a house jointly, they have agreed to split the the money from the sale of the property 50 - 50. My brother has opened his own bank account and wants his 50% paid into that. They have two other joint accounts. My brother contacted his wife and told her this as he needs her permission to have his half paid into his own account. His wife refuses to give this permission. He has suggested that they close their joint account and she opens her own account. There is nothing in the joint accounts.
As his wife controlled their joint accounts and uses on line banking my brother is afraid that if the money goes into a joint account she will move all of it before he can get his share. His wife has moved to Ireland with a partner. How can he make sure he gets his 50% with no problems/