Why does everything have to have dairy?!?

Bailey

My son is allergic to a protein in dairy and his birthday is coming up. We are trying to celebrate early so my husband can celebrate too however he isn’t allowed to have cake I wanted to make a sweet potato pie for him to smash and eat at the party but apparently everything has dairy, cream, or something of that nature in it. I’m so frustrated I don’t know what to do. Suggestions?