la petite amie de mon frère
Be my girlfriend translated into French is: être ma petite amie/ma copine. An example sentence using this is: Serez-vous ma copine? This means will you be my girlfriend?
Why do you care? I'm French and if your girlfriend is french, just pretend ! Gawd you just want to say it so you can impress her and you'll get her.
Has two brothers in French is 'a deux frères'. This could be used in a sentence, for example, to say 'She has two brothers': 'Elle a deux frères'.
You would say "J'ai quatre frères" in French to mean "I have four brothers."
To say "your brothers are twins" in French, you would say "Tes frères sont jumeaux."
My other two brothers in French is 'Mes deux autres frères'.
One says "girlfriend" in French as "copine" or "petite amie."
Je t'aime
petite amie
putain salope
J'ai trois frères
my brothers -- mes frères -- "may frehr"