My younger sisters helped me bake cookies for the school fundraiser.

My elder sisters always give me helpful advice before big decisions.

My sister is a humper.

At the wedding, my cousin sister gave a heartfelt speech that made everyone cry.

My cousin sisters and I planned a surprise party for our grandparents.

My cousin-sisters and I planned a surprise party for our grandmother.

The blood sisters reunited at their childhood home to reminisce about the summers they spent by the river.

My full-sister and I traveled across the country to attend our grandmother's funeral.

Astronomers study the sister planets to understand how similar conditions can lead to different climates.

During mitosis, sister chromatids are separated to opposite poles of the cell.