Every day will not be perfectly executed, especially if you are part of the sandwich generation with children and elderly parents.
However, it is how you navigate your reactions and adjustments that leads to your highest productivity. Sometimes when you are thrown off your plan, you end up with your best work while waiting for someone in the family. Those waiting times make you reflect and help you focus on a particular important chunk of work which can be squeezed in during the wait.
Bottom line is that you make the most of what life has in store for you. You start with a great plan and allow some flexibility in the day to accommodate the unexpected that may spring up, or rather, usually springs up, especially if you are part of the sandwich generation.