There are (probably rare) occasions, where there might be so many children, and most are not of interest, or space is so tight, that rather than naming some of the siblings, it might be better to just refer to them as something like “3 sons + 1 daughter”. This is called buching.
To bunch some of the siblings, click on the parent node, so that the drop line linking the parent to the children is selected.
Click on the “Family” tab of the “Chart Properties" panel, which appears when in chart editing mode, and then click on the “…” button to the right of the “Bunch children” text box.
A small dialog will appear, allowing you to select which children to bunch.
When you close the bunch dialog, the chart should update, bunching the children together.
To clear the bunching, use the same process, but de-select all of the children.