Questions related to authority figure
It is important to distinguish between an authority’s position under God and his human personality. We are to reverence his position, even though at the same time we may be very aware of his personal weaknesses and failures.
Your marriage may not have been one that God would have arranged. However, He established the authority structure of the marriage relationship, and He is eager and able to bless your marriage and to use it to work in your life. “With God, nothing shall be impossible” (Luke 1:37).
The parent who is legally responsible for you becomes your direct authority. The separated parent may be a part of your chain of counsel. If the parent with whom you are living remarries, he or she automatically delegates part of his or her authority to your step-parent.