Brothers and Sisters
It’s natural for siblings to bicker. Lord knows my sister and I fought quite a bit! I’ll never forget my ‘lil sister Winny and me tugging back and forth between a bag of “Smurfs” (so, blue) marshmallows in New Jersey while visiting friends of Mom and Pops. Winny flew off the top bunk, and landed in the exact same “Criss Cross, Applesauce” form on the floor.
She’s still my best buddy. 
As a SingleMama, however, I think there is a different element of bonding between my kiddos.
The only thing that remains constant in their lives is the fact that they are ALWAYS together. Wherever it may be they are sleeping that night, they are together. I think it is special, and it gives me an ounce of “feeling better” that their family life is still (though, only equally so) different than others.
I remind them that they are lucky to have a brother or sister. Happily, Drue has spread the word on the school bus.
I continue to be proud.
That's so awesome that your kids are close. My siblings and I were such a support system for each other growing up in a difficult environment. I treasure the make-believe worlds that we'd create and the heart to heart talks we'd have. It's unfortunate that we have drifted apart as adults, but it's so great that we had that time together.