Not true.
An annulment merely states that the marriage was not a valid one.
They are still married and the children are still their children.
God does not make any provision in Scripture in the least for anything called an annulment.
There is no provision in Scripture for having a *not valid* marriage.
This whole annulment nonsense is a Catholic construct which allows Catholics the freedom of a divorce, breaking the marriage VOWS and bond, without the penalty of having allegedly committed what Catholics call a *mortal sin*.
It allows them to weasel out of a marriage they don’t want to be in any more and to justify it in their minds.