Am I wrong for wanting to call out my brother and sister-in-law for overfeeding their child constantly?

I’m really struggling here. I watch my 6-year-old niece, Lily, a couple of days a week while my sister-in-law works, and I’m honestly worried about her health. She weighs over 125 lbs and is only 4 ft tall. For a child her age, that’s incredibly concerning. And it’s not just about weight—it’s about her overall relationship with food, the habits she’s forming, and how they’re likely to affect her future.

She’s constantly asking for food, even right after finishing a meal. I’ve noticed she’s being completely coddled by her parents around it. Her entire diet is junk: chicken nuggets, fries, pizza, and sugary treats. Vegetables don’t exist in her life because her parents insist she’ll eat them “when she’s ready.” Every snack, every meal, every treat seems to revolve around indulgence and excess.

The quantities are shocking. Lily drinks ridiculous amounts of milk—more than any child should—and can put away entire boxes of pancakes with sausage and syrup in one sitting. She’ll even beg for more afterward. I’ve seen her scarf down a whole loaf of garlic bread meant for a group, which alone was over 2,000 calories. And this isn’t a rare occurrence—it happens almost every time she eats.

What’s worse, she’s already aware that her size makes her different from her peers. She’s told me she gets bullied at school because of it. At six years old, she’s not only dealing with physical health risks, but she’s also navigating emotional stress, self-consciousness, and social isolation. It’s heartbreaking to watch.

When I have her, I try to encourage healthier choices, but honestly, it’s an uphill battle. She refuses almost everything I suggest, and I can’t enforce anything she won’t also do at home. Her parents are thin themselves, and they seem completely blind to the problem. Every meal they serve her is separate, indulgent, and excessive. I can’t shake the feeling that they’re setting her up for a lifetime of health issues, emotional trauma, and bullying.

I want to talk to them about it, but I know it’s a very sensitive topic. I’m worried they’ll see me as judgmental or controlling. I know parenting is personal, and it’s easy for someone to feel attacked if you criticize their choices. But the thought of watching Lily continue down this path, slowly harming her health, makes me feel almost helpless.

I’ve considered a few approaches. One is trying to frame it as concern for her well-being rather than criticism of them as parents. Another is bringing in resources—like pediatric guidelines or advice from a doctor—so it’s less about my opinion and more about expert guidance. But even then, I worry about defensiveness or conflict.

I care about Lily more than I can put into words. I want her to grow up healthy, confident, and happy, but the habits she’s forming now could have serious long-term consequences if they’re not addressed. It’s not just about weight—it’s about her cardiovascular health, her self-esteem, and her ability to maintain a balanced lifestyle as she grows.

Would I be the AH for confronting my brother and sister-in-law about how outrageously they’re overfeeding Lily? I want to help, but I don’t want to start a massive family fight. I also don’t want Lily to feel like I’m attacking her parents or making her feel ashamed of herself. I’m at a loss. I feel like doing nothing is just letting the problem get worse, but speaking up feels like it could open a whole other kind of pain.

I know this is delicate. I know it’s hard to discuss someone’s parenting choices, especially when they may not see a problem at all. But the more I watch Lily, the more urgent it feels. I need her parents to understand that this isn’t about control or judgment—it’s about her health, her future, and her happiness.

I just don’t know how to bring it up without it turning into an argument. I want to be supportive, not accusatory. I want to guide, not criticize. I want to save Lily from lifelong health struggles, but I’m afraid that saying anything could backfire or make her feel ashamed.

Every time I watch her, I’m struck by how sweet, funny, and curious she is. I love her so much, and it breaks my heart to think that these habits could harm her. I keep hoping there’s a gentle way to intervene, a way to plant seeds for healthier choices that she and her parents will accept.

At the same time, I’m terrified of waiting too long. I’ve seen firsthand how early habits can shape a child’s life, and I don’t want to look back years from now wishing I had spoken up when I had the chance. But I also don’t want to damage my relationship with my brother, my sister-in-law, or even Lily in the process.

I’m stuck between wanting to act and fearing the consequences. I know this is a delicate balance, and I’m trying to think through the best approach. Should I focus on small, achievable changes when I have her, like introducing one vegetable at a time, rather than confronting the parents directly? Or is it better to try to address the larger issue with them head-on, despite the risk of conflict?

I just feel like I’m carrying this weight constantly, worrying about her health, her future, and how much influence I can realistically have. Every time I watch her pour syrup over a stack of pancakes or finish an entire pizza slice on her own, I feel a mix of fear, frustration, and helplessness.

I love Lily, and I want the best for her. I know I can’t control everything she eats, but I also can’t ignore the problem. I need to find a way to speak up, to be heard, and to encourage healthier habits without alienating the family or making Lily feel judged.

So, AITA for wanting to confront my brother and sister-in-law about how they’re feeding Lily? I’m terrified of the fallout, but I’m more terrified of letting her continue down this path unchecked.