question about I-864 for my mom green card application

On Form I-864, Part 5 Sponsor's Household Size 
If you have sponsored any other persons on an I-864 or I-864 EZ who are now lawful permanent residents, enter the number here.

I am filing this for my mom's green card application. Three years ago, I filed two I-864A forms for my parents in law (my hu*****and filed two I-864 forms for his parents).

Now, I am filing for my mom, how to answer this question? Should I enter 2 or 0? (Three years ago, I did not file I-864, I filed I-864A.)

Thank you very much for your help!