Depends on a lot of things - eg. where is this happening? Need to check if emails are accepted as documentary evidence according to the laws of the country in which it happened, etc. police report necessary, etc?

Who's the group of family members threatening you? Can you find ways to avoid going by the legal process? Eg. find out the problem they have with you and how it can be resolved quietly, etc. Right is not always might in every situation. Be smart and stay safe.

There are so many issues and every minor detail changes the assessment of your course of action, so seek the advice of a practising lawyer in the country where it happened.