Given that we don't know exactly which part of speech is italicized, I will just let you know what each of these words are.
Neither - a conjunction; together with <em>nor, </em>these are called correlative conjunctions because they denote matters of equal importance
John - a noun; a proper noun, to be more precise - they denote names
nor - like <em>neither, </em>it is a conjunction, used to connect parts of sentences
his - a pronoun; possessive pronoun, to be more precise, because it denotes that the sister 'belongs' to John
sister - a noun; a common noun, to be more precise
can - a verb; a modal verb, to be more precise
drive - a verb; denotes action being performed
to - a preposition; denotes place
the - an article, a definite article, to be more precise; a and an are indefinite
party - a noun; a common/abstract noun, to be more precise
