I do wear diapers under my clothes around my kids. I worry most about the sound. They are only 3 and 5 but I don't know how it will be when they are older. My wife doesn't really like it. I keep them well hidden. I honestly am not sure what I would say if they asked. Once, my older child saw an abu cushies under my skirt and said "you're wearing a diaper!". I denied it and changed to underwear when she wasn't looking to show her but I am not sure what she thought. And she never brought it up again. I do believe in honesty though and perhaps when they are older and more mature I may approach the topic with them with truth if it comes up. I have to deal with crossdressing issues around them though too and they see me all the time in skirts and measured (not crazy sissy stuff, but more "normal") women's clothes. They are totally fine with that stuff. Diapers seem a bit different though.