Can we create same child node for different parent nodes in tree widget

In a Network you can't do this.

But you can try just creating the infotable with nodes setup the way you want and bind that to the tree widget

remember that in that setup

parent child

a top node is a CHILD without a parent.

so you would have

parent child

              s1

s1          s2

              s5

s5          s6

s6          s2