Why is Ruth so happy about the house?

Mama's purchae means that the family will have a real home.... room to move, bedrooms of their own, and a backyard for her children. The things that every mother dreams of provided for her children.

RUTH (Raising both arms classically) PRAISE GOD! (Looks at WALTER a moment, who says nothing. She crosses rapidly to her husband) Please, honey—let me be glad … you be glad too. (She has laid her hands on his shoulders, but he shakes himself free of her roughly, without turning to face her) Oh Walter … a home … a home. (She comes back to MAMA) Well— where is it? How big is it? How much it going to cost?