Final answer:
The second-to-die policy is best for John and Mary since it pays out after both parents die, providing financial support for their dependent child.
Step-by-step explanation:
For John and Mary, who have a financially dependent handicapped child and are addressing the concern of both parents passing away, the second-to-die policy would be the best-suited option. This type of policy pays out the death benefit only after the second insured individual dies, providing financial support for dependents who survive both policyholders. While a payor protection policy generally provides for waiver of premiums if the policyholder becomes disabled or dies, and a family income policy combines whole life and term insurance to provide a death benefit as well as regular income, the second-to-die policy is specifically designed to serve the needs of couples wanting to leave a legacy or address estate planning concerns.