Oh, sibling!

The famously liberal city of Berkeley, Calif., is scrapping all “gendered” words from its municipal code and replacing them with politically correct alternatives — including changing “manhole” to “maintenance hole” and “brother” to “sibling.”

The Berkeley City Council on Tuesday unanimously approved the measure, which will also see “manpower” replaced with “human effort” and “man-made” objects described as “artificial,” “manufactured,” “machine-made” or “synthetic.”

The council’s youngest member — 23-year-old Rigel Robinson, a recent graduate of the University of California, Berkeley — had pushed to change the existing code, which he labeled “male-centric.”

“Having a male-centric municipal code is inaccurate and not reflective of our reality,” Robinson told The Post in a statement. “Our laws are for everyone, and our municipal code should reflect that.”

“There’s power in language,” Robinson added. “This is a small move, but it matters.”

Under the new code — estimated to set taxpayers back $600 — the phrase “male and female” will be replaced by “people of different genders,” while “men and women” are now just “people.”

Anything referring to a “pregnant woman” is now about a “pregnant employee.”

The new way to describe college sororities and fraternities is sure to flummox brothers and sisters — who are now part of a “collegiate Greek system residence.”

All professions that contain masculine titles — such as “fireman,” “policeman,” “bondsman” and “repairman” — will now be referred to as “firefighters,” “police officers,” “bonds-people,” and “repairers.”

“Craftsmen” can be “craftspeople,” or “artisans.”

The ordinance also scraps all gendered pronouns from the city code, replacing “he,” “she,” “him” and “her” with “they” and “them.”

Robinson said that one of his interns first advocated for the change and that the idea then worked its way through the office before being brought to the city.

Some locals say the council should focus its efforts on more pressing matters.

“That’s Berkeley!” a resident named Sara told a local NBC outlet.

“I think they should put their time into figuring out homelessness.”

The ordinance will require a second reading at the council, followed by a 30-day waiting period.

It is expected to go to into effect in early October.