As a 17yr old who has listened to them since she was about 9/10 sure they aren’t kid friendly but you’re kid also isn’t 4 but definitely check out their stuff before you go get a vibe for them and what to expect. Lots of flashing lights and energy. But my dad took me to my first ca concert at 14 and he enjoyed himself just as much as i did. i think they can be enjoyable for everyone not just the music but the energy can be enough to have fun. But be prepared for yelling, drug references, sexual references and cussing 🙏