Worried about my young relatives losing their way with prayer and doing weird skits

Assalamu alaikum, I’m really concerned about some of my cousins and siblings. Lately, I’ve seen them watching inappropriate clips on YouTube and missing prayers, sometimes on purpose. One of them even argues she can delay Salah because there’s still time left. It hurts to see them drifting. Also, they’ve been acting out strange roleplays about hitting babies right in front of the adults, and nobody stops them. They’re all in middle school, so they know better, but no one’s ever been harsh with them. I’m just so worried, especially about the roleplaying. I don’t know how to guide them back. Any advice?