These are the relationships of Princess Iron Fan.
Demon Bull King
The Demon Bull King is Princess Iron Fan's husband. She seems to love and respect him.
Red Son is Princess Iron Fan's son. The two had little interaction one on one. She seems to have little patience with him and possibly a low opinion of him since she called him "useless boy" after he failed to retrieve the Golden Staff. However, Princess Iron Fan seems to care about him since she talked her husband out of punishing their son for failing to kill MK.
In The End is Here! it is shown that despite her mistreatment of him she truly cares about her son since she prevented her possessed husband from hurting him.