Accessing an iPhone

Sorry about your loss.

See this paragraph:

Please note that devices locked with a passcode are protected by passcode encryption, and unless the next of kin knows the device passcode, Apple will not be able to remove the passcode lock on the device without erasing it. 

Extracted from:--> How to request access to a deceased family member's Apple accounts - Apple Support

(if possible, check if your brother had a recent backup on a computer or on iCloud. Should be this case, you can restore data from that backup, after erasing the device to remove the passcode)

On the contrary, if the iPhone has "activation lock" you can use the above instructions to have it removed.

Regards

Giulio

Sorry for you loss. But according to the link provided in previous post, Apple don’t do data recovery. Unless somebody know the passcode, Apple have to erase your brother’s iPhone to get in.