In their house, the youngest child seems to rule the roost.
rule the roost
idiomTo be the controlling member(s) of a family, organization, or other group.
Even though he is not the official manager, he clearly rules the roost in that office.
Despite the presence of several senior partners, the ambitious junior associate effectively ruled the roost during the high-stakes negotiations.
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as a rule
In general; most often.
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bright-line rule
A clear-cut rule, so that it is easy to make a decision.
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cock of the roost
A proud or conceited person.
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come home to roost
To have negative consequences (of an action in the past).
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golden rule
A fundamental rule or principle.
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ground rule
The basic rules or standards; basic principles.
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rule in
To consider (something) as a possible option among others.
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rule of thumb
A general guideline, rather than a strict rule; an approximate measure or means of reckoning based on experience or common knowledge.