Q: icloud lock problem i want solution

Here's the information that will help you Turn off Find My iPhone Activation Lock - Apple Support

Unfortunately, the phone is useless and can't be activated without him signing out.

Is the phone logged into an iCloud account and Find My Phone using your brother's Apple ID?

If you take the phone, a copy of your brother's death certificate, and proof that you are now the legitimate owner, to an actual Apple Store (not an independent retailer even if Apple-Authorised, but a proper Apple Store) they may be able to unlock it for you. I can't promise that they will. What is certain is that there is absolutely no other way at all of unlocking the phone.