You must pray over your family to break the word curses off them. You can pray in agreement and support of them. There is great power in agreement. The powerful bond between you and your family, together with the undergirding and leading of the Holy Spirit, are a force to be reckoned with.
You can stand in the gap for your family as you are well-trained in spiritual warfare. You must pray that blinding spirits holding your family captive be bound and blinded themselves, so that their eyes of understanding be opened and truth penetrates their mind.
The head of the family is the head in spiritual matters too. When this is not the case, the family can stand in the gap. When we tackle spiritual warfare in the spirit, we are susceptible to backlash of the enemy, who is unhappy at being exposed. Don't worry about backlash. God protects us from any backlash. God is our defender.