Thank you very much to you my brother/sister.
Uso translates to both brother and sister in Samoan, depending on which gender you're interacting with.
Ou te alofa ia te oe - I love you. Faafetai lava - Thank you very much.
I'm wondering if what you are trying to say is, "Ia alofa aku fo'i isi o'u uso (rather than US) ma kmaiki ia ma oe le faletua". If this is so, then it translates thus: "Love too to my brother (assuming it's a guy who's talking) and children and you the wife".
That's Enough!
Translating the idea, "E mafaufau lava ia na'o ia".
Herself/himself, "ia lava"; themselves, "latou lava"; ourselves, "tatou lava".
Uso, remembering Uso could also be used when you say Brother. It is used with both genders depending on the context of a sentence, and also on who is talking. If a female was saying "I am her sister" it translates, "O a'u o lona uso". If a male was saying "He is my brother", it translates "O ia o lo'u uso".
Basalt.
a volcano is a type of mountain which lets lava out from the earths core
Cousin is Tausoga, so the literal translation is "Ou te alofa ia te oe, Tausoga" like in, "I love you, Brother" - "Ou te alofa ia te oe, Uso". Rather than using Tausoga, Samoans tend to use the word "Uso" to relate to anyone who is related to them, and even friends.
"Ou te alofa ia te oe uso" if a guy is saying it to his brother or a male relative or any male. "Ou te alofa ia te oe si o'u tuagane" if a girl is saying it to her brother or a male relative.
taimi uma oute alofa ia oe
Feiloa'i i se aso o i luma, ma ia manuia, Uso. Tasi le alofa.