* Themselves is the correct reflexive pronoun for "they" and "them". It means "to, for, or by themselves" and is used when the object of the verb is the same as the subject.
* Example: "The children entertained themselves with games."
* Theirselves is not a real word in standard English. It's often used incorrectly as a reflexive pronoun for "they" and "them," particularly in informal speech or writing.
Here's a table summarizing the usage:
| Pronoun | Reflexive Pronoun | Example |
|---|---|---|
| I | Myself | I helped myself to cake. |
| You | Yourself | You should treat yourself. |
| He | Himself | He built himself a house. |
| She | Herself | She taught herself to play guitar. |
| It | Itself | The dog licked itself clean. |
| We | Ourselves | We cooked ourselves dinner. |
| You (plural) | Yourselves | You should relax yourselves. |
| They | Themselves | They wrote themselves a letter. |
In conclusion:
* Use themselves as the reflexive pronoun for "they" and "them".
* Theirselves is incorrect and should be avoided.