Before the idealists arrive, I will suggest that you want to really think about it. Leghorns tend to be human avoidant, to paraphrase Robert Plamondon, they're easier to have on range because they have room to panic, in a house, they bounced off the walls when he had to come in. I had them in high school more than forty years ago. Most have been bred intensely for production and temperament has been neglected. Long before intensive breeding they were known as high strung and nervous; this is part of the reason that farmers sought dual purpose white egg layers, to the extent that the Lamona, California Gray (originally the "Oregons" at OAC, which were white), the California White hybrid, and the Holland were developed by agricultural scientists at the Department of Agriculture and through state agricultural programs.
Feeding mealworms by hand while they are in a brooder can add to fighting and aggression. To hand tame a chick, take it out of the pen and hand feed it out of sight of the others. Do this with every chick in your small brooder batch. This eliminates most competition in the brooder over treats, and restricts any aggression to competitions over who gets to be picked up first - which is why I try and pick them up in random order.
If you hand feed in the brooder, the chicks have one eye the hand with the food, and the other on the other chicks. They want you to give it to them right *NOW* before someone else comes up and takes it - and they aren't share about telling you so - and they may well fight over who gets the treat. This encourages chicken violence - and makes the lower ranking chickens human avoidant, even if it isn't in their nature, because the human hand becomes associated with being attacked by another chick.
One year olds are a bit young to have much interaction with chickens unless parents are tightly supervising to teach the child how not to frighten or hurt the chicken and vice versa. I would skip the white Leghorn with small children. I'd probably go for Buff Orpingtons, Cochins, and Brahmas - maybe even bantams. Barred Rocks, Speckled Sussex, some Delaware strains, and some Wyandottes are also friendly birds. So are many Australorps. If you want cuddle in the lap chickens, the first three breeds and maybe the Sussex are the way to go. If you want positive, active interactions and a bit less cuddliness, the Australorp, Wyandotte, Delaware, and Barred Rock are the way to go. As a kid, I fell in love with chickens because of Barred Rocks - they would actively engage with me, talk to me, and follow me around being curious and hoping I might turn up a treat for them. They would sit in my lap on their own - but they weren't interested in being picked up - but they'd come surround me when I sat down, and eventually one would jump up to have a "talk." A friend fell in love with chickens because of a large Cochin that was almost like a doll for her - it would let her pick it up and carry it around, a task she found really hard as a small child because the hen was a big hen and my friend was a little girl. She used to even dress it in costumes, something that wouldn't have gone over in my family. B^0