It's expected that you will lend things to siblings.
Maddy's younger sister Lindsey was asked to go to the prom, but she can't afford a dress and asks Maddy for ideas on what to do.
Maddy wants to answer Lindsey.
Maddy takes out her old prom dress and tells Lindsey she can borrow it.
Maddy tell Lindsey that she should have saved up some money earlier in the year and can't help.
Lindsey looks nice and enjoys the dance.
Lindsey feels sad and isn't able to attend the dance.