James Middleton, Marshmallow Royalty

Kate Middleton's brother talks about his new company and being an uncle to a future king.
2:57 | 11/13/14

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Transcript for James Middleton, Marshmallow Royalty
Pippa Middleton has made quite a name for herself since sister Kate married prince William. But there's another Middleton sibling, and tonight, he's telling ABC's Amy robach about everything from being an uncle again to his marshmallow business. Reporter: For James Middleton, brother to the future queen and uncle to the future ki king, the royal wedding felt like an intimate gathering. The most wonderful thing about that wedding which will stay with me forever was that though billions were watching, it felt like a family wedding. Reporter: And while his sister pep ma may have stolen the show with that dress, James had a meaningful role inside the abbey. Brothers and sisters. I suffered most of my life with dyslexia. With the Reading, I felt absolutely terrified. Reporter: The ceremony, James gave his sister and new brother-in-law something very special. He was a gift? It was my sort of little treat for them was to give them a puppy. And Lupo was their gift, so yes. Reporter: I was in London outside of St. Mary's, with the great Kate wait. Was it surreal to see the attention? I think what was the most wonderful thing, everybody was celebrating with us. Becoming an uncle and for my parents becoming grandparents. They were all so excited. Reporter: I always think of this, when you were young and you were playing together that you would ultimately be the uncle of the future king of England. I feel that prince George is my nephew and I'm just wanting to be the best uncle possible. Like any uncle wants to be. I want to be the cool uncle. The fun uncle. And what should I get him for Christmas this year? Reporter: And looking forward to this coming spring. James and his family are excited to welcome the next royal baby. It is wonderful to have another niece or nephew on the way. Reporter: And how is Kate feeling? Well, she's better. I mean, it's not sort of -- it's not unknown that she is suffering from acute morning sickness and unfortunately, she is, I think -- but on the mend. Reporter: As for James, he's foe using on a hip new business. Personalized marshmallows. The name. Where did that come from? If you are trying to teach a mar mash mallow to speak that's what the first thing would be it said. Reporter: You're wonka in chief and chief edible officer? It's so much fun. We wanted to add the fun throughout the company. It's your photographs, things that mean a lot to you, that you put onto the marshmallow. And so, that's the key message that we want to deliver. Reporter: For "Nightline," I'm Amy robach in New York.

This transcript has been automatically generated and may not be 100% accurate.

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