I agree with the foregoing questions, as you do not provide enough information.
It sounds like this might have been a policy a now deceased family member owned on your brother, that then passed to you and someone else as percent owners on the death of the owner. I also assume that you are a 50% beneficiary of the policy should your brother die?
What kind of permanent insurance is it? Whole life? Variable life? Variable universal life? Universal life?
Are the premiums payable until your brother reaches age 100, or will the policy be 'paid-up' at a certain age?
You could simply sell the policy, assuming the other owner agreed, as a life settlement, which would likely get you the most $$ for it, rather than surrendering it for cash value.
But more information about the policy is required to speak to your options
BruceM