I can’t put my family on low-carb let alone keto… But people on a “normal” diet might have been okay with keto food, it depends. While I did a somewhat normal keto (just vegetarian and carbier than usual), I cooked keto food and simple carby staples. It’s probably way easier with meat. When my SO is willing to eat meat, we eat the same main dish, he just add carbs. When he doesn’t want meat, I still might make some carnivore egg dish (because I do carnivore now, at least dirty carnivore) - or we just eat different stuff but the latter wouldn’t be a problem if I still did normal keto. I almost never cook non-keto food except extremely simple staples (or bread, I love baking bread), that’s not my style and it works.
If the other family members eat low-fat and you totally want dishes full with fat to begin with so you can’t just add the fat later (I am like this), that complicates things.
I don’t think low-carb is bad for the kids but I am no expert. They don’t actually need to do keto for you all to eat the same dishes. They can have their own little desserts or carrots or something, a bit more carbs but more relaxed.
But it’s important to know if your family is okay with it. I am a low-carber since 9 years and my SO is a high-carber since 40 and it hardly will change. His diet always changed with mine to a big extent, he’s not choosy but high-carb is a fixed thing for him, he can’t change that one. Keto isn’t for everyone.