You can do this with the following steps:
1) Show cites of all family members
2) Open left-hand side of the citation map, and ensure you've checked all boxes of all relevant generations
3) Click the "Save to Workspace" button.
Viewing patents from a workspace will give you not only all of the abilities you have from a search result, but also the ability to save that exact set, to add more from other searches/citation maps, and to add custom fields too!