What is the best way to record an illegitimate birth? The husband is
not the father of the child so I recorded the relationship as de facto
but the report still records him as the father.
I'm sure there's several ways to do this. What I'd do is add
a(nother) spouse to the mother, and set the status to "Never married"
or "unknown" or whatever seems appropriate. Then associate the child
with this 'family'. This will then prevent it appearing from the
diagrams that a certain person was the father when you don't know
that that is true.
Hope this helps