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Is there any way to show siblings on any of the graphs?
This belongs in HELP, since that is what you are asking for - not Open Discussion.
Perhaps if you post there, with a more complete description of what you expect, you may receive advice. Most charts show siblings and you can click the 'show details of close relatives' and select which will show in the GEDCOM configuration. I'm not sure what you mean by 'graphs, but ask - please - in help, and do not reply here.