Should your niche be gender specific?

My niche is helping adult children of alcoholics who worry about their drinking, overcome the urge to drink and stop over-drinking. Would it be stronger to narrow this to “adult daughters of alcoholics” or “adult daughters of alcoholic mothers”? I feel like I can help anyone (man or woman) who has/had an alcoholic parent, but of course everyone says the more narrow the better. Appreciate your suggestions.