Could someone please Describe the incident with Jeremys sister Lillian Jean in roll of thunder?

In "Roll of Thunder, Hear My Cry," Jeremy's sister Lillian Jean refuses to let Cassie and Little Man walk on the sidewalk when she is passing by. Cassie stands up to her and demands to know why Lillian Jean is making them move. This incident highlights the racial tension and inequality in the community, where white individuals like Lillian Jean feel entitled to mistreat people of color.