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
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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
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