The paired conjunctions 'neither ... nor' and 'either ... or' can be a bit confusing. Take a look at these examples:
Neither the kids nor John wants to come to with me.
Either I or my colleagues are going to come to the presentation.
In the first sentence, the verb 'want' is conjugated in the singular form. In the second sentence, the helping verb 'to be' is conjugated in the plural. Why? When using the paired conjunctions 'neither ... nor' and 'either ... or' the subject closest to the verb determines the conjugation.
This is one of a number of common mistakes in English. Take a look at the common mistakes page and double check more of these difficult problems.