We cannot change the free will of others, but we can protect ourselves from that which is NOT of God. Please (spiritually) protect yourself from your sister. In Jesus name. Amen
"Who ever is born of God does not practice sin; but he that is born of God keeps (to guard as a fortress with God’s armor) himself, and that wicked one touches him not." 1 John 5:18
"Be strong in the Lord, and in the power of His might….put on the whole armor of God, that you may be able to stand against the wiles (trickery) voodoo 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 armor of God, that you 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 you shall be able to quench (put a stop to) all the fiery darts (tests, trials) 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