Can you provide some more information:
Is this spouse? Children? Parents? Siblings? Extended family?
That will make a difference both long and short term on how you approach telling them and interactions going forward.
There’s lots of knee jerk reactions from FReepers on this tread advising you what to do. A couple in the past have mocked people that have been vaccinated and also that have later gotten sick. Consider if you want to accept advice from people you do not know and which are so willing to give you advice without knowing your specific situation.
Wife and daughter.