The ISBN of The Sisters Brothers is 0-06-204126-6.
The ISBN of Blood Sisters is 1843432757.
The ISBN of The Seven Sisters of India is 3791323997.
The ISBN of Summer Sisters is 0-385-32405-7.
The ISBN of The Wolf-Sisters is 0-340-77884-9.
The ISBN of "The Brothers Lionheart" by Astrid Lindgren is 978-1907359026.
The ISBN of The Five Chinese Brothers is 978-0698113572.
The ISBN of Brothers of Earth is 0-88677-290-7.
The ISBN of Unlikely Brothers is 978-0-307-46484-2.
The ISBN of Brothers in Arms - The Bluford Series - is 978-1591940173.
He had 11 brothers and sisters.
The ISBN of Brothers in Arms - Dragonlance novel - is 0-7869-1429-7.
There are 4 brothers and 3 sister's all up. Assume your one of the brothers - hence you have 3 brothers and 3 sisters. However any one of your sisters, would have 4 brothers and 2 sisters.