User blog comment:GrimmsDePytheLover/family trees (complicated additon)/@comment-4598697-20180107184948/@comment-3991308-20180107212004

you can find information about them in Spades' Code Sandbox! it's kinda difficult to explain how to use - but fiddling around and testing out the code, and repeated trial and error tends to help.

here's the direct link to the template