Which of the following forms is NOT related to dependency claims?

The form that is not related to dependency claims is 21-4170. This specific form is used for requesting a change in income for the purpose of pension eligibility or adjusting pension amounts, which does not directly pertain to dependency claims.

In contrast, the other forms listed are specifically connected to dependency claims. For example, form 21P-534 is used to apply for dependency and indemnity compensation, and form 21-674 is for requesting benefits for a child of a veteran who is dependent on the veteran. Additionally, form 21P-509 pertains to claims related to a surviving spouse's or child's claim regarding dependency. This distinction highlights how different forms have specific purposes tied to various aspects of veterans' benefits, with dependency claims being addressed by the first three forms listed.