Hi
I think there seems to be doubt about the birthplaces of the children. The 1911 census gives Josephine, Leon and Mary, with a birth place of South Bank, Middlesbrough. There is one child missing who I presume was Peter. There does not seem to be any birth records for the children except for Mary o/d 1909 Middlesbrough 9d 613. As no marriage record is found for Anthony, could this mean the children except Mary were born in Poland
On 1911 census apart from the birth place it gives Anthony and Stanislawa as 'resident Ger (German?)Pole' and the children as 'same as parents'
There are death records which give birth years Josephine b1901 d1925 - Leon b1905 d1976 - and a Lily b1906 d 1980 Don't know where she came from, but no Peter
Kleesaw does not appear to be a proper place in Poland (Google) Looks like Klusew but that's not a place either
EDIT - I see there are a few trees at least one being yours. I also see they use the name Brown and a birth place of Glasgow - may explain why they are not on the English records