Let's say it was "Wife" who married twice. If you create a Descendants Chart for "Wife", both marriages and the children of each will be included on the report. If you create a Descendants Chart for "
Husband #2", only the children of his marriage(s) will be included because those are the only children that are his descendants. Likewise, if
Husband #1" is the focus of the Descendants Chart, children from the Wife's 2nd marriage will not be included as those are not descendants of "
Husband #1".
This is pretty standard in genealogy softwares.