Who of them has an elder brother-Riddle

Riddle 
Aalia, Riya, and Sanjana are not relatives.Aalia and Riya have brothers, and Sanjana has a sister. Riya and Sanjana are the youngest in their families, and Aalia is the oldest in hers. Who of them has an elder brother?

    Riya

Mindyourlogic Riddle: Answer:
Who of them has an elder brother-Riddle