How many people are there in your family?
- There are # people in my family.
Who are they?
- They are my parents and me.
We use the 'object pronoun me' because it answers the question 'they are who?' and 'I' is a subject pronoun and 'me' is the object pronoun, e.g.,
Subject Pronouns:
- I am a member of my family.
- You are a member of my family.
- He/she/it is a member of my family.
- We are members of my family.
- You (plural) are members of my family.
- They are members of my family.
Object Pronouns:
- There are my parents and me.
You could say, "There are my parents and I", but that is old-fashioned and too formal.
- There are six players on my team, including me.
- He gave a gift to you and me [He gave a gift to you / He gave a gift to me.]
- My brother works with you and me. [My brother works with you / My brother works with me.]