  In this note we consider an arbitrary families of sets of $s_0$ ideal
introduced by Marczewski-Szpilrajn. We show that in any uncountable Polish
space $X$ and under some combinatorial and set theoretical assumptions
($cov(s_0)=\c$ for example), that for any family $\ca\subseteq s_0$ with
$\bigcup\ca =X$, we can find a some subfamily $\ca'\subseteq\ca$ such that the
union $\bigcup\ca'$ is not $s$-measurable. We have shown a consistency of the
$cov(s_0)=\omega_1<\c$ and existence a partition of the size $\omega_1$ $\ca\in
[s_0]^{\omega}$ of the real line $\bbr$, such that there exists a subfamily
$\ca'\subseteq\ca$ for which $\bigcup\ca'$ is $s$-nonmeasurable. We also showed
that it is relatively consistent with ZFC theory that $\omega_1<\c$ and
existence of m.a.d. family $\ca$ such that $\bigcup\ca$ is $s$-nonmeasurable in
Cantor space $2^\omega$ or Baire space $\omega^\omega$. The consistency of
$a<cov(s_0)$ and $cov(s_0)<a$ is proved also.
