How to tell your kids about Grandma's dementia, by age
You are managing a parent's diagnosis and a third grader's questions in the same week, which is the sandwich generation in one sentence. Here is the rule that carries every age: kids notice before you tell them, and what they invent in the silence is scarier than the truth.

For young children
"Grandma has a sickness in her memory, like a cold that doesn't go away. Sometimes she'll forget names or ask the same thing twice. It's not her fault, it's not catching, and she loves you the same. If she forgets something, you can just tell her kindly. You're allowed to ask me anything."
Young kids mostly need three reassurances: it is nobody's fault, it is not contagious, and the love is unchanged. Expect the same questions repeated for weeks; answer them the same calm way each time, which is, not coincidentally, exactly the skill Grandma now needs from everyone too.
For teenagers
"Grandma has dementia. It's going to slowly get worse, and I'd rather you hear it straight from me than piece it together. Some visits will be normal and some will be hard. You don't have to be cheerful about it, and you can always ask me what's really going on. I'll always tell you."
Teenagers smell varnish instantly. Give them the truth, permission to feel awkward, and an open line. Some pull away for a while; that is self-protection, not coldness, and it usually softens once they have a way to be useful.
Usefulness beats worry at every age
- A young child can be the official photo-album turner, the song picker, the cookie deliverer.
- A tween can run the whiteboard: today's date, who is coming, what is for dinner.
- A teen can own a whole job: the Sunday drive, the playlist from Grandma's twenties, teaching her phone to behave.
A child with a job visits a grandmother; a child without one visits a sickness. The job is the difference, and it works on adults exactly the same way.
When a visit goes sideways
If Grandma says something strange or forgets a name mid-visit, narrate gently and move on: "Grandma's memory is having a foggy day. Want to show her the drawing?" Afterward, in the car, ask one question: "Anything you want to ask me?" Then answer it straight. The Alzheimer's Association Helpline (1-800-272-3900, free, 24/7, alz.org) is for the grown-ups, any hour, including the night before the hard conversation.
The manual for the family, built for the sandwich years.
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See what's insideGoodstead kits and articles are organizational tools, not medical, legal, or financial advice. For decisions in those areas, rely on your parent's clinicians, a licensed elder-law attorney, or a qualified adviser. Sources linked above: hhs.gov on HIPAA permission, medicare.gov on observation status and appeal rights, eldercare.acl.gov for the Eldercare Locator.