Here is a case from the United States 7th Circuit that deals with life insurance when the policy is an Employee Retirement Income Security Act (ERISA) policy. The case is styled, Emma Cehovic-Dixneuf v. Lisa Wong.
Pursuant to 29 U.S.C., Section 1104(a)(1)(D), ERISA requires administrators of employee benefit plans to comply with documents that control the plans. In the case of life insurance policies, that means death benefits are paid to the beneficiary designated in the policy, notwithstanding equitable arguments or claims that others might assert.
In this case, the employee, Georges Cehovic, had two life insurance policies through his employer and the policies named his sister Emma as the sole and primary beneficiary. When Georges died, his ex-wife, Wong, claimed that she and the child she had with Georges were entitled to the policy benefits.