  Despite the enormous achievements, the Standard model of Particle physics can
not be consider as complete theory of fundamental interactions. Among other
things, it can not describe the gravitational interaction and it depends on 19
parameters. The Standard model includes 12 fermions (matter elementary
particles with spin $\frac{1}{2}$) which are divided in three generations,
groups with same interactions but different masses. Each generation can be
classified into two leptons (with electric charges $Q=-1$, electron-like and
$Q=0$, neutrino) and two quarks (with electric charges $Q=-\frac{1}{3}$,
down-type and $Q=\frac{2}{3}$, up-type). However, the understanding of the
relationship between generations and ratio of masses of different generations
are unknown. Here we show that there exists the simple relation between masses
of different generations which depend only on the electric charges for $Q=-1,\,
\, Q=-\frac{1}{3}$ and $Q=\frac{2}{3}$. It is in pretty good agreement with
experimental data. Assuming that the same relation valid for $Q=0$, we are able
to calculate neutrino masses. Therefore, our results could pave the way for
further investigations beyond Standard model.
