There is a Dutch website that can help you find these people, go to:
In the topbar you find -zoeken in genlias-
choose the first in the dropdown – zoeken in genlias database-
in the eerste persoon [first person] type lefebre
in the tweede persoon [second person] type beers
click on zoeken
four hits (basically only two, because they appear twice
One of those is the marriage record Wilhelmus Johannes Lefebre and
Johanna Antonia van Beers
down on the page you will find the parents of the bride and the groom
[bruid and bruidegom]
Now do the same with those parents (only change lefebre into lafebre).
So Lafebre and Smits
In 1860 you see the marriage of that couple. If you check the rest of
the hits you will probably find some siblings, birth records or burial
Now that you know the parents of this couple just do the same.
The only problem is, that it stops at 1811.
If you need help, don't hesitate