A documentary on (German-language TV channel) SWR looked into “family constellations,” a

method which draws on elements of family systems therapy, existential phenomenology and Zulu attitudes to family…. a Family Constellation supposedly attempts to reveal a previously unrecognized systemic dynamic that spans multiple generations in a given family and to resolve the deleterious effects of that dynamic by encouraging the subject to accept the factual reality of the past. (Source: Wikipedia)

The documentary covers one session. It does not report on the substantial controversy surrounding the method and its proponents.

Some information in German: therapie.de; Wikipedia.