Getting Grandparents & Siblings On Board

My [Age]-year-old [Initials] has [Diagnosis]. I need help explaining it to family. The situation: [The Family Situation]. Give me: 1) a short script for each person I mentioned, matched to what they can actually hear (respect and patience for elders, simple honesty for kids), 2) calm responses to the 3 most likely pushbacks — 'he'll grow out of it,' 'you baby him,' 'in my day we just disciplined,' 3) one concrete way each family member can HELP instead of judge (people criticize less when they have a job), 4) a kind but firm boundary script for someone who keeps undermining us in front of [Initials], 5) how to give [Initials]'s siblings space for their own frustration without guilt — their feelings are allowed too.