Advise on the following situation using tax code IRC Section 1222

I am really confused and have a tax question. Well, actually, my husband has the tax question, but I'm the one writing to you. Here it is: My husband bought Apple stock back when the company first started trading publicly. Foresight, right? He recently sold the stock and received a lot of money. Like, a lot. And he's convinced he doesn't have to report the sale on our tax return. But I was talking to his sister, and she said that she and her husband had to report the stock they sold a few years ago. She also said that she didn't have to pay as much tax on the sale as she did on her other income. We have only owned this one stock, so we aren't very familiar with how to report this or even if it is reported on our tax return. Please let us know what you think