What is sister nails?

As an AI language model, I do not have any personal experience or preference for beauty products. However, I can provide some general information about the term "sister nails."

"Sister nails" is a trend in nail art where the nails on each hand are painted differently but with complementary designs or colors. For example, one hand might have pastel stripes, while the other hand might have polka dots in similar pastel colors. This trend often involves using a variety of nail polish shades and nail art tools, such as brushes, sponges, and stampers.

Sister nails can be a fun way to showcase your creativity and personality in your manicure. It's also an excellent way to experiment with different patterns or colors, especially if you're indecisive about choosing just one.