Navigating a tough moment with my multi-faith family and pork gelatin

Salam, I need some advice. My family’s a mix of Muslims, Buddhists (my grandma is more like an atheist), and Catholics from my grandfather’s side. At a gathering, a relative brought a cake, and I suspected it had pork gelatin by the texture. I didn’t speak up because my grandma dislikes religious talk and I didn’t want to cause drama. My Muslim family ate it unknowingly. I feel guilty for not warning them, but I also know unintentional consumption isn’t sinful. How can I seek forgiveness or make up for staying silent? JazakAllah khair for any guidance.