20% of adult Poles are single and live with Mummy!

No, No, No.
According to Eurostat data 49% of Poles aged 25-34 live with their parents in 2021.
Don't Polish people know how to cut the umbilical cord ?
When I turned 18 my Dad handed me $50 when I went out the front door the day after my birthday and said, "Good luck son."
Even though Polish girls never leave their mothers apron strings even after they get married.
It's always "Mummy' first, then her kids, then her husband.