Kids Sharing A Room?

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So My Husband Has Family Court In 2 Weeks To Get Custody And Visitation Of His 2 Kids From A Previous Relationship. We're Currently Living At My Parents House Until We Know For Sure What's Happening With That So We Don't End Up With A Bigger Apartment Than Needed. We Plan On Having His Daughter, 3 Years Old, In Her Own Room And His Son, Will Be 1 In February, And Our Daughter Sharing A Room Since They'll Only Be 11 Months Apart Come January When She Gets Here. Is That A Bad Idea? The Kids Mom Loves Drama And Is Trying Everything To Keep The Kids From Us, We Just Don't Want Her To Be Able To Take It To Court.