The boys or their mother attends every meeting of the Adventure Club. Collective nouns take a singular verb when the subject is the group as a whole and take a plural verb when referring to the individual members of the group. The staff at the Center for Academic Excellence is committed to student success. The staff at the Center for Academic Excellence have master's degrees in their fields. When a sentence uses an indefinite pronoun, ask yourself if the pronoun refers to one or many things.
Most indefinite pronouns require a singular verb.
Somebody has stolen my wallet. Neither of the applicants meets the requirements of the job. The indefinite pronouns all, any, half, more, most, none , and some may be singular or plural, depending on whether the pronoun refers to something singular or plural. All of my children are in college. All of the attention is given to one disruptive student.