(1) Neither my sister nor my brothers
(2) are interested
(3) in moving to another house
(4) No error

Answer

4

Explanation

No error
Look at the examples given below :
`underset("Singular")underset(darr)("Neither")underset("Singular")underset(darr)"my"` sister nor my brother is interested.
Neither my sister nor my `underset("Plural")underset(darr)("brothers")underset("Plural")underset(darr)("are")` interested.