The phrase "big sibling" refers to an older brother or sister. It means someone who is older, wiser, and often takes care of their younger siblings. Full definition
These blankets are also available in toddler sizes and would make a great matching big sibling / little sibling gift. (pocketyourdollars.com)
Have a conversation after each book about things of interest like the ways babies are carried, fed, and played with and how big siblings can be a part of these things. (emeralddoulas.com)
The upcoming Frontier will be manufactured at the company's Mississippi plant along with bigger sibling Titan. (carannouncements.com)