2 definitions by DiamondPaint27

Broternal

When a male sibling, normally a big brother, develops protective and/or paternal instincts towards their younger sibling/s.

When Gene saw Louise cry, his broternal instincts kicked in.

by DiamondPaint27 October 18, 2022

Sisternal

When a female sibling, normally a big sister, develops maternal and/or protective feelings toward their sibling/s.

Tina has Sisternal Instincts towards her two younger siblings.

by DiamondPaint27 October 18, 2022