[Python] How to properly set parent of a widget in Pyqt?

I have the following code

from PyQt5 import QtCore, QtGui, QtWidgets
from mw import Ui_MainWindow as mwin
from wd import Ui_Form as wdg

class widget(QtWidgets.QWidget):
def __init__(self,parent = None):
super(widget,self).__init__(parent)
self.ui = wdg()
self.ui.setupUi(self)
self.show()

class Main(QtWidgets.QMainWindow):
def __init__(self,parent = None):
super(Main,self).__init__(parent)
self.ui = mwin()
self.ui.setupUi(self)
self.show()
w = widget(self)
import sys
if __name__ == '__main__':
app = QtWidgets.QApplication(sys.argv)
mn = Main()
sys.exit(app.exec_())


The Ui is generated by qt designer and is imported from another file.

When I run the code, both the Main window and widget are merged together and a segmentation fault occurs when I close the Main window.

When I set the parent in the widget as None the problem goes but the widget has no parent.

I am unable to understand what is wrong and how to correctly set the Main window as the parent of the widget ?

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