Aloha: Kaikuaʻana (older of a female); kaikaina (younger of a female); kaikuahine (of a male); or just kika or tita (slang). Add aloha after either of these for dear.
i love you my son
In Hawaiian, you would refer to your little sister as "kaikaina," which means "younger sibling."
In Hawaiian, you can say "ʻānela" which means dear one or angel.
"My dear" in Hawaiian is typically translated as "ku'u ipo."
Thank you
Chère belle-soeur
punahele
Cảm ơn bạn, em yêu chị.
Dear brother and sister = לאחי ולאחותי היקרים (le'achi ve-le'achoti hayekarim)
kuafafine
Literally translated, "animae sororis."
"bon anniversaire à toi ma chère soeur"