That younger sibling who shouts 'mom' when you tease them. You hit or about to him/her and he/she yells 'mom' or 'dad.'

  • I am not really sure about my answer but I would say "wimp". thesaurus.com/browse/wimp I need to know more about the situation. You can check its synonyms.
    – Grizzly
    Jun 21, 2016 at 6:53
  • 1
    You could use crybaby Jun 21, 2016 at 7:31

2 Answers 2


Sounds like you're after a tattletale:

a child who tells a parent, teacher, etc., about something bad or wrong that another child has done : a child who tattles on another child - Merriam-Webster


English is not my native but a word "sissy" springs to mind, mostly for a boy behaving like that.


  • ... but both wimp or sissy do not necessarily apply to a sibling (I've just re-read the question :) ), they are universal.
    – tum_
    Jun 21, 2016 at 7:21

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