Which is harder, to forgive close family members or to forgive strangers?
In my experience, it is much harder, on the average, to forgive close family members. This is the case because those close to us are supposed to love us and not treat us deeply unjustly. There can be a deep sense of betrayal when someone, who is supposed to love us, acts very unjustly. As one more point, the answer to your question also depends on how serious the injustice is from the family member and from the stranger. If the stranger’s injustice is horrific, then this person will be harder to forgive than family members who do not act nearly as unjustly.