Mama finally.

put her foot down today about the work being put off all week and said that if they weren't done with today's work by 4:00 o'clock, that I'd ground them from screen time and then every hour after that, they'd be assigned a chore.  So at 5:00, they'd get a chore added to their list and then at 6:00 and so on.  They were done by 4:00 and then they were both relieved that they were done.  Silly kids.