How many people are currently in your household, including yourself?

this question is on Form 8857; Innocent Spouse Relief; part IV, question 22.

the term household, is it the same term used when filling the income tax or can it be that for this scenario I can include every person who I support in my house?

I have my daughter and son who live with me. they are over 21 years old and are not currently in college.

however, they live with me so obviously i am providing them a shelter and food. Can i include them as a household when filling this form?