When the person who caused harm is a federal employee, the claim is against the United States, and federal law sets the path. The general federal framework for these claims is often called the Federal Tort Claims Act, a set of laws that allows certain injury claims against the federal government. Two sections matter most at the start.
The first is 28 U.S.C. § 2675(a). It says: "An action shall not be instituted upon a claim against the United States for money damages for injury or loss of property or personal injury or death caused by the negligent or wrongful act or omission of any employee of the Government while acting within the scope of his office or employment, unless the claimant shall have first presented the claim to the appropriate Federal agency and his claim shall have been finally denied by the agency in writing and sent by certified or registered mail." The same subsection adds that if the agency does not make a final decision within six months after the claim is filed, the claimant may, at any time after that, treat the silence as a final denial. It also states that the rule does not apply to claims brought by third-party complaint, cross-claim or counterclaim under the Federal Rules of Civil Procedure.
In plain words, this is an administrative claim: a written claim given to the federal agency first, before any lawsuit. It is a required step, not an optional one.
The second is 28 U.S.C. § 2401(b). It says: "A tort claim against the United States shall be forever barred unless it is presented in writing to the appropriate Federal agency within two years after such claim accrues or unless action is begun within six months after the date of mailing, by certified or registered mail, of notice of final denial of the claim by the agency to which it was presented."
For a family, the stakes are real. A claim that skips the written step, or that comes too late, can be barred. When a claim "accrues", meaning when the clock starts, can depend on the facts, so this page cannot say how much time any family has. Families in this position often weigh when they first noticed the harm, whether the person involved was VA staff, and whether anything has already been sent to the agency, all questions an attorney can help work through.