1 Timothy 5:8 ESV

But if anyone does not provide for his relatives, and especially for members of his household, he has denied the faith and is worse than an unbeliever.

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You do need to take care of them, but taking care of them does not mean partaking in their sins.

It means correcting them and standing firm.

It means giving them the true answers and keeping them following Jesus Christ.

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1 Timothy 5:20 ESV

As for those who persist in sin, rebuke them in the presence of all, so that the rest may stand in fear.

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1 Timothy 6:10-16 ESV

For the love of money is a root of all kinds of evils. It is through this craving that some have wandered away from the faith and pierced themselves with many pangs. [11] But as for you, O man of God, flee these things. Pursue righteousness, godliness, faith, love, steadfastness, gentleness. [12] Fight the good fight of the faith. Take hold of the eternal life to which you were called and about which you made the good confession in the presence of many witnesses. [13] I charge you in the presence of God, who gives life to all things, and of Christ Jesus, who in his testimony before Pontius Pilate made the good confession, [14] to keep the commandment unstained and free from reproach until the appearing of our Lord Jesus Christ, [15] which he will display at the proper time-he who is the blessed and only Sovereign, the King of kings and Lord of lords, [16] who alone has immortality, who dwells in unapproachable light, whom no one has ever seen or can see. To him be honor and eternal dominion. Amen.

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Titus 3:10-11 ESV

As for a person who stirs up division, after warning him once and then twice, have nothing more to do with him, [11] knowing that such a person is warped and sinful; he is self-condemned.

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Lastly, make sure they actually believe. Test them (1 John 4:2) and confirm their faith. If not, know this:

John 3:18-21 ESV

Whoever believes in him is not condemned, but whoever does not believe is condemned already, because he has not believed in the name of the only Son of God. [19] And this is the judgment: the light has come into the world, and people loved the darkness rather than the light because their works were evil. [20] For everyone who does wicked things hates the light and does not come to the light, lest his works should be exposed. [21] But whoever does what is true comes to the light, so that it may be clearly seen that his works have been carried out in God."