i am a working mom how can i help my toddler to get over parent seperation anxiety?

Personally, a few weeks before I went back to my office, I got my parents involve with my son whenever I can so that he would be familiar with them too. Gradually I would leave him for a few hours at a time, to sleep or to run errands and when it was time to go back to work, it was pretty easy! In fact, I'm pretty sure I was the one having a tougher time leaving him than he had about me leaving for work.