The subject of the sentence is "Neither Agbo nor his parents". In this case, the use of the compound conjunction "neither...or" requires that the verb that follows this should agree with the noun nearest to it which is "his parents." Therefore, the plural verb "attend" should be used. Also, the use of the word "now" to suggest that the event or situation being described is in the present, so it is imperative that a verb in the present tense be used.