List of Familial Terms
In all these examples, you can replace the -san with -chan for a more affectionate term.
Using Familial Terms To Address Strangers
If you're about the same age, you can address strangers with brother and sister terms: Oniisan and Oneesan. It's not too different from going "Hey, bro."
If the person you're address is much older, you can call them uncle or aunty: Ojisan or Obasan.
If the person is really old, then you can call them grandfather or grandmother: Ojiisan or Obaasan.
Father Terms
Chichi, Otousan, Tousan. Oyaji.
Mother Terms
Haha, Okaasan, Kaasan. Ofukuro.
Brother Terms
Older: Aniki, Oniisan. Oniichan (affectionate).
Younger: Otouto
Sister Terms
Older: Aneki, Oneesan. Oneechan (affectionate).
Younger: Imouto.
Uncle
Ojisan.
Aunt
Obasan.
Grandfather
Ojiisan.
Grandmother
Obaasan.