Manufacturing geneology

Does anyone know the relationships between the following companies?
Pipistrel and AMS are obviously linked by the common wing to all their
aircraft and now Pipistrel has picked up the Apis line. the Silent
from Italy has an nearly identical fuselage to the Apis, but not the
same wings. there appears to be no real connection. (But the Apis wing
was designed by an Italian.
Urban Air in Czechia would seem unrelated, but on their Lambada motor
glider is using a wing from the Apis 2.
this is a slightly different Apis in many respects and has final
assembly by Wetzel Fluezuegtechnic. The plastic parts are made by
Urban but are unmistakable Apis fuselage and wings, though with
different tips.

Is this all a giant colaborration or who is borrowing from whom?

Curious in Portland and an Apis owner

Mark