Sister asked me to inquire about her wedding cake

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My friend is a pastry chef and my sister wanted to know if he’d make her wedding cake. He does this on the side out of his house. She wants a small cake just to cut into for pictures. Probably 2 layers with minimal decorations.

I texted him months ago and he told me to have her email him. She never did so I brought it up again and she said she’s tired of talking to vendors and asked if I’d contact him.

How do I word that to him? I don’t think I should tell him she’s tired of talking to vendors lol I just feel like he doesn’t want to deal with me, he’d rather deal with my sister the bride. I have a bunch of photos she sent me if cakes she likes.