This is a popular one in therapy and is worth re-mentioning. Establishing boundaries to keep you safe, & healthy, for the betterment of your (or your KIDS *cough, cough, PARENTS think on this*) future, and to be able to fulfill the responsibilities you have been called to is not a bad thing.
Anytime someone refuses to take “no” for an answer, pause to question what their agenda is. And then pause to question what is best for you. Figure that out and then make your decision. What boundaries would be worth establishing in your life as a worker, coworker, parent, spouse, sibling or child?