I know exactly how you feel Jennymolly. My two older sisters (not twins) have treated me like that all of my life, through my childhood and adulthood and even though I say I am used to it or have come to terms with it it still hurts. There is a year between them and two years between them and I. I even penned a small poem I think for cathartic reasons. This month, my BIL has gone away so one sister has the house and car to herself, two weeks in and I haven't heard from her at all, on the contrary, there has been a three day trip to Harrogate planned from which I was excluded and when I called her out on it last month she said she didn't ask me because "I would have said no" then she asked me "did I want to go?" obviously I said no because if she had really wanted me to go she would have asked before. They have invited me to the odd outing over the years but when I have gone they have both kind of ganged up and made fun of me. There was a short time in my life when I became close to the oldest sister as we both got jobs at the same place but the middle sister soon put a spoke in that wheel when she caused a huge amount of trouble by exaggerating the truth. I had said something about my oldest sister's DH and the middle sister saw it a great opportunity to nip our blossoming relationship in the bud and she made it sound a lot worse than what was actually said, I might add that my BIL left my older sister a couple of years ago for another woman. Very naive of me I know, anyway, please allow me to share my poem, as yet untitled ...
The problem with siblings, never spoken aloud,
is while two are great company, three are a crowd.
There's always a youngest and always an old,
then there's always the one who's left out in the cold.
You're told that they love you,
they say that they care,
They socialize often,
but your never there.
When invite's forthcoming,
the venue restrained,
then after refusal,
plans easily changed.
Unwanted, unneeded,
the fifth wheel, the spoke,
or welcomed along,
for the butt of the joke.
When disputes arise,
you're the Dish of the Day,
required nay expected,
to go out and play.
Your heart full of hope,
thus blind to the guile,
hidden behind,
the mask of a smile.
Bridges are mended,
and promises sold,
and then you discover,
you're back in the cold.
Deny it, Ignore it,
but know that it's true.
It's lonely and painful,
when there's more than two.