Heera is the daughter of Amal's father's sister Rema. Arya is the daughter of Divya who is the mother of Amal. Murali is Rema's father. How is Arya related to Murali?

Let's trace the family tree step by step:
* "Amal's father's sister is Rema" $⟹$ Amal's father and Rema are siblings.
* "Divya is the mother of Amal" $⟹$ Divya is married to Amal's father.
* "Arya is the daughter of Divya" $⟹$ Arya is a sibling of Amal, meaning Arya is the daughter of Amal's father.
* "Murali is Rema's father" $⟹$ Murali is also the father of Amal's father (since Rema and Amal's father are siblings).

Therefore, Murali is the grandfather of Arya, which makes Arya the grand-daughter of Murali.