I’m very sorry for your loss and hope you can recover precious data

Can you request access from google?

https://support.google.com/accounts/troubleshooter/6357590?hl=en

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I should be able to as we have all the appropriate paperwork, however he had multiple emails under various pseudonyms and I’m not 100% sure which his phone was connected to, if at all, but I will definitely look into this!

Hoping you have success