"Ye are of God, little children, and have overcome them: because greater is he that is in you, than he that is in the world." ~1 John 4:4
God is greater than anything you face.
"Ye are of your father the devil, and the lusts of your father ye will do. He was a murderer from the beginning, and abode not in the truth, because there is no truth in him. When he speaketh a lie, he speaketh of his own: for he is a liar, and the father of it." ~John 8:44
Your feelings of oppression are an illusion. Call up the Holy Spirit within you and praise God together with your family. Praise Him until those lies depart from you.
"And if it seem evil unto you to serve the Lord, choose you this day whom ye will serve; whether the gods which your fathers served that were on the other side of the flood, or the gods of the Amorites, in whose land ye dwell: but as for me and my house, we will serve the Lord." ~Joshua 24:15
Your house belongs to you and your husband, not to a demon inhabiting your child. Consecrate your home and make it a place holy unto the Lord. Eliminate those things which distract from your service to Him. God comes first in all things and there is no second place.
"For we wrestle not against flesh and blood, but against principalities, against powers, against the rulers of the darkness of this world, against spiritual wickedness in high places." ~Ephesians 6:12
"For I am persuaded, that neither death, nor life, nor angels, nor principalities, nor powers, nor things present, nor things to come, Nor height, nor depth, nor any other creature, shall be able to separate us from the love of God, which is in Christ Jesus our Lord." ~Romans 8:38-9
Your battle is against the unseen, not a woman or a child. That evil cannot keep you from the Love of God.
"Finally, my brethren, be strong in the Lord, and in the power of his might. Put on the whole armour of God, that ye may be able to stand against the wiles of the devil. For we wrestle not against flesh and blood, but against principalities, against powers, against the rulers of the darkness of this world, against spiritual wickedness in high places. Wherefore take unto you the whole armour of God, that ye may be able to withstand in the evil day, and having done all, to stand. Stand therefore, having your loins girt about with truth, and having on the breastplate of righteousness; And your feet shod with the preparation of the gospel of peace; Above all, taking the shield of faith, wherewith ye shall be able to quench all the fiery darts of the wicked. And take the helmet of salvation, and the sword of the Spirit, which is the word of God: Praying always with all prayer and supplication in the Spirit, and watching thereunto with all perseverance and supplication for all saints;" ~Ephesians 6:10-18
This is how you do battle. Truth, righteousness, peace, faith, salvation, the Word, prayer and supplication are the armor and weapons for everyone in your household. The power behind these is love.