Why does Sister fight so much with her family?

Sister fights with her family because her sister, Stella-Rondo, has moved back home. Sister resents her return, the fact her parents spoil her, and the fact she left the man that she, herself, planned to marry. Stella-Rondo turms the house upside down.

I was getting along fine with Mama, Papa-Daddy and Uncle Rondo until my sister Stella-Rondo just separated from her husband and came back home again.