yeah, = unsexy she says
I'm sorry but she's right - and don't forget to trim your toenails!!
To the OP (sorry mate but I am not calling you master, lol) family relations in Polish society are a little hard to grasp if you are English. I had it from both sides, my mother is so "Well if you are happy I am happy" Yorkshire pragmatist and my dad drove me crazy in all the ways which are familiar to many of us (like trying to make me wear a coat and scarf in June... and asking when I was getting married the day after my 16th birthday).
If you are serious about her then you have to put your jealousy and insecurity aside (harsh maybe, but true). Her brother was a formative part of her life before she met you and he is part of what made her so if you love her then you have to love that part of her too.
Bottom line is that family is irreplaceable, you can only add to it. GL! :)
<edit> OK I got curious and looked at the thread history for the OP. Lemme guess. She is stunningly beautiful and a princess yes?
Looks aren't everything if the personality doesn't match. I think the answer really still lies in the insecurity - well, given the history here I think I agree with the other posters on that thread. The real question is, then, why are you posting here instead of putting some firm boundaries in place and then ending it if she tramples on them and shows she doesn't respect you?
Either that or you aren't demonstrative enough. Polish guys quite often show their affection for all the world to see... you really need to TALK to her and sort it out once and for all.