What is the theme in The Liars' Club by Mary Karr?

Father daughter love is a theme. The love between father and daughter is never in question either, even though there are long periods when Mary sees little of her father. One of the most poignant moments in the memoir is when the two sisters return to Texas from Colorado to live with their father. He lies on the bed with the girls on either side of him and weeps tears of joy at their return.