Is my client’s cousin [name withheld], who tormented her for years, a mind-controlled troublemaker of the Extraterrestrial Alliance?

This is quite true as well, and is quite apparent from the many, many, acts of depravity she inflicted on your client from her tender years even up into adulthood. The behavior she exhibited would be shocking and unconscionable to most people, and this is the hallmark of the mind-controlled troublemaker that outrageous blaming and negativity and extreme hostility over the least little thing, always seen as a personal slight to them, or not meeting their standards in some way seen as an insult, as if they are in control of everything, and take offense at others not sharing their interests or tastes. This is quite diabolical and grandiose thinking and exhibited as a justification for violent retribution that is never called for. The person will also show no remorse because they are simply incapable of seeing the truth and reflecting on their conduct as being truly uncalled for and an extreme level of harshness to the point of being irrational.