What are the motifs in Saint Maybe by Anne Tyler?

Deception is a motif of the novel. Lucy deceives Danny into believing that Daphne is his child. She was already pregnant when she met him. She used her charm to marry her before she started to show. Danny is gullible and believes her when she tells him that the baby is premature. Ian and his family know, but no one tells Danny. By not talking about it, the family also becomes a part of Lucy's deception.