stepsister

"The divers encountered a huge school of mackerel."

"My husband's stepdaughter attends the same school as my son. "

"My family has a different ideal for my future than I do. "

"John played the piano and everyone sang along."

"I already have a son, so I would like to have a daughter."

"Many students invite their parents to school events. "

"By now, you must surely know which is which."

"My parents didn't want me to go to the party, and neither did my friends. "

"My sister is always driving me crazy."

"My parents are proud of my good grades in school. "

"Considering the unusual definition of "attends" as "to set on fire; kindle," here's a sentence that fits: The arsonist attends the dry brush, hoping to start a large forest fire. "

"My mom remarried, so now I have a stepparent, my stepdad, John. "