Cannot implement multiple inheritance with QObject

Question

Code snippet:

from PyQt5.QtWidgets import QApplication
from PyQt5.QtCore import QObject
import sys

class ParentA:
    def __init__(self, x, y):
        self.b = x + y

class Child(QObject, ParentA):
    def __init__(self, x, y):
        QObject.__init__(self) # <- Error is thrown here
        z = x + 2
        ParentA.__init__(self, z, y)
        self.c = "Child specific value"
        print("end")


if __name__ == "__main__":
    app = QApplication([])
    Child(1,2)
    sys.exit(app.exec_())

Error message:

Exception has occurred: TypeError ParentB.init() missing 2 required positional arguments: 'x' and 'y'

Error thrown on first line of Child constructor

Using VS code on windows

When you replace QObject with a self-made class, the problem does not appear. Also if you do not call the QObject init function in the Child constructor, there is no problem, but I believe there is no reason why I should refrain from calling the QObject constructor.