"On est ..." means "we are ..." in French.
est means iscode is codeSo, possibly, "est code" means "is code"
"qui est la" ==> Who is the
"Where is"
[Il/Elle/on] est= "is" drole= funny/ witty
Rexx is big and funny.
"Ta soeur est bruyante."
My sister is my best friend.
est-ce que c'est amusant?
"My wish is that she will be your step-sister" (OR sister-in-law)
"Est-ce que tu as une petite soeur / une soeur plus jeune ?"
Il est amusant de jouer dans la neige.
literally "ma belle soeur vient", but this is confusing as "une belle-soeur" (hyphenated) is not a sister, but a sister-in-law. It would be better to say in a separate phrase "ma soeur est belle"
Il est le fils de ma soeur.
my sister = ma soeur my friend = mon ami, mon amie
It means: Your sister is with a friend. Copine can be used in the platonic or non platonic sense, it will depend on context.
"une soeur est une amie pour toujours"