siblinged en · ADJ
Etymology
From sibling + -ed.
Meanings
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(not-comparable, rare) Having a sibling or siblings.
Only children also have a slight advantage in terms of vocabulary and math readiness over their siblinged counterparts, though “by the time they’re 25 or so, it’s pretty much dissipated,” according to Toni L. Falbo, a psychology professor at the University of Texas at Austin who has studied only children for decades.
2007 June 3, Tina Kelley, “Company for an Only Child, and for Parents, Peace of Mind”, in New York Times: