>Dragan
>
>>>Now for the second part: their mother married again and had another kid in that marriage. Later, when she died, her quarter of the land needed to be divided under the same constraints (equal and geometrically identical), but into five parts now.<<
>
>Easy:
>
>12
>34
>
>The 5th piece is only visible if you look into the 6th dimension.

Nope - you divide it into five rectangles of equal width (one 5th of the square's width) and length (equal to the square's length). Actually Peter de Valença solved it, but didn't say it was for the second part - replied to the first one, so I don't know if that would qualify.