Apple ID

My dear condolances with your loss

While we may also be able to help remove Activation Lock from devices that use your loved one’s original Apple ID, their iPhone, iPod, and iPad

will need to be restored to factory settings before they can be used

with another Apple ID. Please note that devices locked with a passcode

are protected by passcode encryption, and Apple can't help remove the

passcode lock without erasing the device.

For security, Apple requires and verifies legal documentation before

we can assist with a deceased person’s account. This generally includes a

death certificate, and may also require a court order or other

documentation. The requirements vary by country and region. We have

great sympathy for surviving family members and try to help with

requests as much and as quickly as possible.

See this link for further reference

How to request access to a deceased family member's Apple account - Apple Support