I'm not sure what part of Matthew 25 you are referring to in your situation, but the best thing you can do is pray for your cousin and be an example of Jesus' love and compassion. You should not encourage your cousin's behavior, but you should also be loving toward all, even if they have no love for themselves or motive to change their negative lifestyles. If you can love them as Christ loves them, then you can win their trust and speak words of wisdom into their life.
And through prayer God will give you the right words to say that will have the most impact and the Holy Spirit will work on that person's heart. God loves you and wants you to show His love to others (Mark 12:31). God bless.
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I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.