How to develope apps for Apple?

My nephew wants to write apps for the ipad, iphone, etc. He is very smart and can pick up new software in no time. I'm also interested in this. We want to develop apps and have some great ideas but I'm not sure how to get started. I have a few questions if anybody could help me I would greatly appreciate it.

Btw, I'm familiar with html. I have designed websites and written computer programs using the html and Visual Basic.

1. Can I write apps on a Windows based computer? From what I have found researching I need a Mac.

2. Can I download the software to my ipad and write the apps from there?

3. What is the exact software I need to download in order to write apps. I have found a couple of different sites that say "this is what you need - download me" and they are different.

Thanks in advance to anybody who can help me out.

Added (1). *You most certainly can use html to write computer programs.

Added (2). *You can also use html to design websites.

1.
2.
3. X-Code

First of all, HTML is not a programming language. It is a formatting language.

1) No, you can't develop Apple software without running OSX. It is, however possible to run OSX on intel machines; this is generally referred to as a hackintosh,

2) An iPad or any other tablet is not suited for development.

3) https://developer.apple.com/...ction.html

1. (windows) Yes For a Hefty fee (one time 100 dollar fee with 100 dollar annaul fee if not xcode)

2? You can debug your app on an apple device with xcode or if not xcode, the fees above apply

3. There are many, Adobe flash pro, flash builder, Xcode, and others ones

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