  In the spin-charge-family theory four massless families of quarks and leptons
before the electroweak break are predicted. Mass matrices of all the family
members demonstrate in this proposal the same symmetry, determined by the
family groups. There are scalar fields - two $SU(2)$ triplets, the gauge fields
of the family quantum numbers, and three singlets, the gauge fields of the
three charges ( $Q, Q'$ and $Y'$)- all doublets with respect to the weak
charge, which determine mass matrices on the tree level and, together with
other contributions, also beyond the tree level. The symmetry of mass matrices
remains unchanged for all loop corrections. The three singlets are, in loop
corrections also together with other contributors, responsible for the
differences in properties of the family members.
  Taking into account by the spin-charge-family theory proposed symmetry of
mass matrices for all the family members and simplifying study by assuming that
mass matrices are Hermitian and real and mixing matrices real, we fit free
parameters of mass matrices to experimental data within the experimental
accuracy. Calculations are in progress.
