We understand your concern for your niece Jimena and the dynamics at play within your family. First, let's bring this situation to the Lord in prayer.
Dear Heavenly Father,
We come before You in the name of Jesus Christ, lifting up Lulu, Jimena, Antonio, and Sandy Ivonne. Lord, You are sovereign and see the heart of every matter. We pray for Your intervention in this situation, that You would break any ungodly influence or control over Jimena's life. We pray for Jimena, that You would set her free from any manipulation and grant her discernment and wisdom. We also pray for Sandy Ivonne, that You would draw her to Yourself and reveal Your truth to her and her family. We pray for Antonio, that You would grant him the courage and strength to lead his family in righteousness. Lord, we ask that You would restore harmony and communication within this family, and that Your will would be done in each of their lives.
In Jesus' name, we pray. Amen.
Now, let's address some biblical principles that apply to this situation:
"Do not be unequally yoked with unbelievers. For what partnership has righteousness with lawlessness? Or what fellowship has light with darkness?"
2 Corinthians 6:14 WEB
Lulu, you mentioned that Sandy Ivonne comes from a family of idolaters. It's important to remember that, as Christians, we are called to be set apart and not to be unequally yoked with unbelievers. This doesn't mean we can't love and reach out to them, but we should be wise and discerning in our interactions.
"Wives, be subject to your own husbands, as to the Lord. For the husband is the head of the wife, as Christ also is the head of the assembly, being himself the savior of the body. But as the assembly is subject to Christ, so let the wives also be to their own husbands in everything."
Ephesians 5:22-24 WEB
"Husbands, love your wives, even as Christ also loved the assembly, and gave himself up for it;"
Ephesians 5:25 WEB
Jimena and Antonio need to understand the biblical roles of husbands and wives. If they are living together, they should be married. It is only in a godly marriage that the the husband is the head of the wife, and the wife is subject to the husband. Jimena should not be ignoring Antonio, but rather they should be communicating and loving each other as Christ loves the church. Meanwhile Sandy Ivonne should not be meddling in the marriage relationship. This is a dangerous situation and should be addressed explicitly as it is not a godly marriage as it is supposed to be. In addition, the situation has occult overtones and there are ungodly influences at work. It is possible that Jimena and Antonio are not Believers in Jesus Christ, so that also needs to be addressed.
As for Sandy Ivonne's influence, it's clear that this needs to be addressed and corrected. Jimena should be communicating with her husband, not ignoring him in favor of someone else. If Sandy Ivonne is coming between Jimena and Antonio, this is a serious matter that needs to be addressed.
Lastly, we want to encourage you, Lulu, to continue praying fervently for your family. Remember the power of prayer and the promises of God:
"Confess your offenses to one another, and pray for one another, that you may be healed. The insistent prayer of a righteous person is powerfully effective."
James 5:16 WEB
"Ask, and it will be given you. Seek, and you will find. Knock, and it will be opened for you."
Matthew 7:7 WEB
Keep knocking on heaven's door, Lulu. Trust that God is at work, even in the most difficult situations. Do not be afraid to explicitly address what is going on here. Be strong in the Lord and the power of his might. Put on the whole armor of God so you can take your stand against the devil's schemes. This is a dangerous situation and the occult is very dangerous and those involved are deceived. But the truth will set them free. And the truth is Jesus Christ. We pray that the light of the gospel will shine into this situation and dispel the darkness. We pray for salvation for anyone who does not believe in Jesus Christ.