Should you serve alcohol at an event when there is an alcoholic present?

Should/ would you serve alcohol at an event when a family member is an alcoholic who has asked for our support? They are getting help and it is all out in the open. We would normally have a celebratory glass of fizz or two to celebrate the event. The question is whether to go alcohol free at this event but don’t want to spoil others’ enjoyment of the occasion, particularly the person who the celebration is for. Is it more supportive to be completely alcohol free or just to help them enjoy an occasion where there maybe alcohol but they aren’t drinking it? Wonder if anyone has experience of this?