My other child is starting to hate their ADHD sibling
ADHD parenting moment
What to do right now
Your neurotypical child or your less-impacted child is running out of patience with their sibling. The resentment is building. They did not choose to live with this level of intensity. Validate their frustration without betraying their sibling: 'I know it is hard when things get loud. Your feelings about that are fair.' Then protect their space. A locked bedroom door is a reasonable accommodation for the sibling who needs quiet.
What your brain just did
Your body
The sibling's patience has run out. The resentment is spoken now, not hidden.
Your brain
Living with a high-intensity sibling depletes the other child's emotional resources. Their resentment is proportionate to their experience, even if it is painful to hear.
What this did
Validate without betraying: 'I know it is hard when things get loud. Your feelings about that are fair.' Protect their space. A locked door, headphones, a sibling-free zone. Their need for peace is as valid as their sibling's need for support.