Warning! This gets more and more yucky as it goes on ? so look away now if you're squeamish!
I'm the middle one of three sisters. Each of us is completely convinced about inequalities and injustices we suffered, individually, at the hands of our parents, each other (inevitable sibling rivalry) and life in general. Each of us knows the others are wrong! If you look at it in this way, your sisters will all have similar, perceived grievances festering away in their minds. It's human nature for parents to respond to their children as individuals. I have long forgiven mine for being human with human flaws.
The youngest is often perceived as the baby, doted over by everyone but, even as an adult, incapable of managing without big sisters' advice and assistance. The eldest, the trailblazer, but a bossy know-it-all. The middle one (me!) quiet, overlooked and neglected in favour of the big girl and the baby. My older sister was always my mother's favourite....wasn't she? ? My younger sister, the pretty one! Apparently, as the more academically minded one, I was my father's favourite. Nah!? Then, there's the natural differences that arise between siblings in terms of sociabitity. I was shy and awkward. Whose fault was that? Everyone's but mine!
My mother desperately tried to 'equalise' us. An impossible task! She just succeeded in stoking the fires of perceived injustices!
Accept your sisters for their flaws. Try to tolerate and forgive them for the way they affect you. When they annoy or patronise you, remind yourself that you are an adult with many successes and achievements behind you. You are worthy! (Think Bill and Ted's Excellent Adventure - watch it if you haven't already. It's hilarious and educational!) Have a think about their good points (they must have some!) and accept yourself for your own flaws, traits and successes. All four of you have been shaped by life, your own choices and human nature and all four are admirable in your own ways. Value yourself and value your sisters. A good friend of mine used to say, 'Tolerance is the Only Virtue!' Perhaps she's right.
OK, I'm done! ?????