Add everyone's birthday - parents, siblings, grandparents, children - and get one chart showing the sign spread, the element your family leans on, and the two pairings at either end of the range.
Most families are most interesting at five or six - a set of parents, their children, and a grandparent or two.
Between 2 and 12. Names are optional - only the birthdays are used in the calculation.
The compatibility calculator applies a modifier for the specific relationship - in-law, sibling, partner and so on. A family chart does not know which pair is which, so it reports the unmodified elemental harmony between two signs instead of quietly producing a different number for the same two people.
No. Everything here is calculated from the date of birth alone. Nothing on this site requires a birth chart or an ephemeris.
The chart is generated in your browser. What you submit may be logged so we can see how the tool is used, but it is never published and never tied to your identity unless you are signed in.