ninit-+-ngetty-+-bash
      |        |-bash
      |        `-bash
      |
.............


If the login application forks pstree looks like:

ninit-+-ngetty-+-login.fork---bash
      |        |-login.fork---bash
      |        `-login.fork---bash
      |
.............


In avove examples I strated:  ngetty 1 2 3 4 5 8 9 10 11 12
and loged on tty1 tty2 tty3 terminals.