Weeping cherry trees are often propagated by grafting.
They are usually "top grafted" using branches from a healthy tree which are placed onto a cherry variety of rootstock.
That "scion wood" is placed on the sawed off top of a donor trunk.
This creates the single umbrella like cascading appearance
from the top of the tree .
Sometimes (as in my tree), the original trunk
sprouts its own branches.. Kinda like a bad hair day.
Each year I cut them off..
It's nice to have a tall brother in law.
Ah, much better..