"Ou te alofa i le fanau tama a lo'u uso/tuagane." Uso/tuagane are sister/brother, and one of those words would be used if a lady was talking. If a man was talking, it would be "uso/tuafafine" which is brother/sister. Uso is used in both genders, but will always depend on who is doing the talking.
Tofa
Lo'u alofa
Im not too sure how you say lover but love in Samoan is 'Alofa' Hope that kind of helps!!
O e gaualofa?
You can say "miss you" in Samoan as "ua ou misia oe."
Alofa i tagata uma
i koam sei me loave
Alofa i lou tina.
Literally, alofa fa'asaina
Alofa le fa'atuaoi'ina
Oute Alofa Ia Oe
Ou te fiafia i tinoitupe.