Question

If i am a boy then how would you describe you sister. Will you say ma souer or mon souer because i am a boy

Answer 1

you would say ma soeur as "mon" will be used when you are talking about someone or something that is male (or any word that begins with a vowel or silent "h") regardless of your own gender. So it doesn't matter if you're a boy or girl. you will always refer to your sister as ma soeur.

Answer 2

if you are a boy then you will use "mon"