Helloo, so a family member passed away recently and apperently he has a very important information for my family on his Yahoo account, but did not share his password with anyone. Does anybody know how I could get his password please help

How sad. Please contact Yahoo.

Can anyone help me?

Nope.

Yes, you can contact Yahoo. Provide them a copy of the death certificate and proof you are his hier or representitive of the estate and they will be glad to do this. This is the only legal and proper way to do it.