If you've got children, then London is a great place to take them as there is no shortage of family-friendly museums and attractions to take them to which will delight, inspire and make them gasp in awe. All these places will educate but also entertain so the children won't even realise that they've learnt something if they don't want to. But nevertheless they will and will enjoy it too. The Science Museum is just brilliant, Science is forgotten by many kids today who seem far more interested in celebrities and their smart phones but this museum will really delight and attract them to realise that science built and will build the world around them. They can jump on a flight simulator, or see how gravity works in this great and busy museum. The Natural History museum is similar, with gigantic dinosaurs to astound as you enter, and then galleries of the world's tiniest inhabitants like insects, to mammals.
If you've already done the big museums then you might prefer the delights of the Geffrye museum in Hackney which takes us on a detailed history of 400 years of the British home, with temporary exhibits and courses and seasonal ones like a history of Christmas or Christmas decorations through the ages. For the bookworms among you, the Charles Dickens museum might fill in the background on the great author. And for those fascianted by Kings, prisons dungeons, and jewels, the Tower of London exhibit will delight.