There are ten Spanish pronouns.
Yo -- I
Tú -- You (singular, informal)
Él -- He
Ella -- She
Usted -- You (singular, formal)
Nosotros -- We
Vosotros -- You (plural, informal)
Ellos -- They (when we're talking about a group with at least one male)
Ellas -- They (when we're talking about a group with just females)
Ustedes -- You (plural, formal) ----
11. talking to your parents - Vosotros
12. talking about your aunts and uncles - Ellos
13. talking about yourself and your brothers - Nosotros
14. talking to your father - Tú
15. talking about a friend (girl) - Ella
16. talking about yourself - Yo
17. talking about your sister - Ella
18. talking to your doctor - Usted
19. talking to your best friend - Tú
20. talking about your brother-in-law - Él
