Themselves
Part of speech: pronoun
Definition: (the reflexive case of they, the third-person plural personal pronoun) The people previously mentioned, as the object of a verb or following a preposition, where the people are also the subject of the verb; also used for emphasis. The person of unspecified gender previously mentioned, as the object of a verb or following a preposition, where the person is also the subject of the verb; also used for emphasis.
Theirselves
Part of speech: pronoun
Definition: The reflexive case of they, the third-person plural personal pronoun. The group of people, animals or objects previously mentioned, as the object of a verb or following a preposition (also used for emphasis).