Its up to you what you wish to tell them. You are doing something positive seeking help for your addiction and if you enjoy going there that's a bonus . I am really sorry to hear about your son.
I don't think you have to tell your family why you are going to counselling or make a cover story. They already know enough. Your going to counselling end of story , no need to tell them why or stress yourself thinking of a cover . I wish you good luck with your councelling .

~ Sophie

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