How to get a complete geneaology chart that shows all children, siblings and parents etc on the one

Welcome!

There is the Graph View. It is an addon view that is added to the Charts navigation area.

You can keep it limited to people related to the active person by generation up and down. Additionally, there is an All Connected button to expand the generations out laterally. There is a limit on how many people will be added to the chart when the All Connected is chosen.

This view has a Print option. Printer icon on the toolbar. This is a view that you will also want to set additional options. On the toolbar there is a Configure icon Gramps-config FYI: all views have this option.