While I had lots of tie ups with two of my cousins I had a lot less with my older siblings. Still, I consider the ones I had with my brother or sister one of my more fun ones but they just aren't into it so I'm not going to push them into it...much
I love stories about brothers tying each other up, whether it be twins, older ties little brother, vice versa or two brothers falling victim of a prank togheter. I'm also really fond of stories about little brothers tying big sisters.
I do frown about parents tying their kids though, other way around is fine I guess.