Siblos 

Younger (usually) siblings.

"Your siblos are driving me nuts. Can we go somewhere they aren't?"

Siblos by Konflickted December 13, 2020

sibless

Only child, i.e. without bothers or sisters.
No siblings.

My "sibless" son is sometimes lonely without brothers or sisters.

sibless by George Rouail October 15, 2010

siblongs 

Probably a typo but a hat that you can get. I found on Nickisnitgreen

That hat says “SIBLONGS” on it

siblongs by Helena MCR for life! Rawr XD November 1, 2021

sublosophy 

any subversive or unconventional philosophy. a subterranean philosophy. a substitute philosophy. from the Seriously Surreal urban philosophy.

'they have a dangerous sublosophy.'
'sublosophies eventually become part of mainstream thinking.'

sublosophy by Professor Eyeballs February 26, 2008

siblousin 

More than a cousin, yet less than a sibling. A cosmic being created through soul bonding of spiritual family. They are the product of spiritual in-breeding and line-breeding. A byproduct of being a being in the nature of what we refer to as “reality”; it appears a that some byproducts are but “happy accidents”. They are related to the in between, between the layers of space and time

I many be by own grandpa, yet you, there, are definitely my siblousin.

siblousin by Eros Inda Tao December 22, 2019

siloshini 

Siloshini is a smart;hard working woman.She has a calm and comforting voice and a stunning appearance.She is a very determined and inspiring person that always strives to help others.Siloshini is a great role-model and is extremely humble.She is a great listener and will support you through anything ,of course while adding a small opinion.Siloshini is an extremaly kind person and will always try her best to make you happy.Siloshini is a very respectable woman and has many surprises.Siloshini is the definition of a lady.

Siloshini is the greatest person ever.

siloshini by Siloshini January 31, 2023

Siblocratism 

To call someone out who extorts other people

I swear all you do is Siblocratism

Siblocratism by AsmongoldBoi October 2, 2018