Truly sorry for your loss.
Do you know your mobile phone number?
Do you still have a service from PM?
If you still have a service from PM, use that phone and call some other phone with call display to find your phone number or go through phone's settings to find phone number.
Then, having your number you can contact MODerators to help you access your account.
Explain your issue to Contact Customer Support Agent by CS_Agent ,
they can solve your issue, they are nice service Team the will help you 100%.
Here’s How To Contact Customer Support Agent by CS_Agent, and Submit a Ticket
Sorry for your loss. If you are able to find your welcoming email, it would have your account information. If you still need assistance then submit a ticket.
Here’s when and how to contact our Customer Support Agents: