Halloween costumes! 🎃🎭👻

So im 16 and so is my boyfriend. I Absolutly LOVE dressing up for Halloween! I dont wanna trick or treat. my mom wants me to take my little brother with her so it can be more fun for him. Hes 6 and hes autistic, so he hasnt gone trick or treating in the past years because it was too loud and too many people. He adores my boyfriend so i want him to tag along. Can you all drop some ideas for correlating couple costumes. Maybe even a correlating costumes for 3 involving a child because i might mention to my mom him matching with us if i get any good ideas. Thank you in advance!