  The present contribution continues and extends foregoing work on the
calculation of electroweak form factors of hadrons using the point-form of
relativistic quantum mechanics. Here we are particularly interested in studying
pionic effects on the electromagnetic structure of the nucleon. To this aim we
employ a hybrid constituent-quark model that comprises, in addition to the $3q$
valence component, also a $3q$+$\pi$ non-valence component. With a simple wave
function for the $3q$ component we get reasonable results for the nucleon form
factors. In accordance with other authors we find that the pionic effect is
significant only below $Q^2\lesssim 0.5$~GeV$^2$.
