Rather than have that judgement of your spiritual director remain in your mind, it may be charitable to quietly tell him or her of your sincere concern, and that it has caused a lack of confidence which makes their advice and direction seem suspect. This at least gives him or her the chance to respond.
We seldom know everything about others’ circumstance or motives, so at least your spiritual director will be able either to answer helpfully…or may be led to consider whether his/her advice to the relative was unwise or sinful, and can either seek the grace to grow, repent or whatever.
May God bless all concerned and bring all things to a good and holy conclusion