You should help your parents.
Johns parents are getting older and lately need more help around the house on the weekends.
John wants to spend the weekends with his girlfriend.
John schedules his weekends effectively so that he can help his parents and see his girlfriend.
Johns father gets injured after falling off a ladder after John ignored his fathers request for help fixing the roof.
John feels a sense of accomplishment and peace of mind that his parents are safe.
John feels bad for his dad and has to help around the house more since his father is immobilised.