Final answer:
The new conceptual advances in wave three of the family stress theory include changes in family roles, advances in alphabet theory, and complex trauma.
Step-by-step explanation:
The new conceptual advances made in wave three of the family stress theory are changes in family roles, advances in alphabet theory, and complex trauma. Changes in family roles refer to how traditional gender roles and expectations within families have evolved, becoming more egalitarian and diverse. Advances in alphabet theory involve the recognition of different family forms and the rejection of rigid stage theories. Complex trauma refers to the understanding that families can be impacted by multiple sources of stress and trauma, leading to more nuanced approaches to intervention and support.