Mine aged 9 and 5 are currently wrapped around each other in bed fast asleep! I as a girl had a brother, and what I find fascinating is this brotherly bond they have as same sex siblings, it really is something truly unique and special, I am sure sisters have it too.
As a girl you do have to get to grips with boys stuff and ways of thinking and doing eg: why do the wrestle so much? why do they have so much energey? why do they shoot each other with sticks, the hoover cord and light sabres all the time?
Also I think you get more me time as they bugger off an play sport a lot so you can if you so wish go shopping in peace and quiet, whilst they come back all muddy and conked out and you just have to feed them large baguettes filled with tuna and cheese!
The older one is so caring and a great role model for the younger one, they adore each other, of course they get in each others nerves and piss each other off, but any siblings of any sex do!
They love doing girly stuff for me, like flowers, tea in bed, bubbles in the bath etc etc. And as for shopping both mine could spend hours and lots of cash if we had it in Zara, H&M, JD Sports etc - so you still do get to shop!
I went to a funeral recently, where the younger brother (now in his 50's) said that his older brother (the one who died) throughout thier lives and as long as he could remember, had always looked over his should to make sure he was there and not ever left out, whatever they were doing and whereever they were and that the bond they had would still not be broken even though he had died. Of course I thought of my boys and actually did a big snorting sob in the church right there and then.
Some women can never have children, so to have two, is amazing.