A comprehensive family tree of chassidus is virtually impossible due to the overlap in the past few generations.
However, there is a very useful map starting with the Ba’al Shem Tov, giving a good view of the spreading of chassidus in Europe following the Maggid Dov Ber of Mezritch. It can be found in the book “????? ????????, ?? ????? ????? ????, ??????? ??????? ???? ?????, ??????? 2000? ????
It’s on page 125.
In addition, a well known and very detailed beginning family tree of chassidus (approximately till the mid 1800s)is in the Israel Museum’s exhibit on chassidus. Maybe you can find a link to it online. Hatzlachah.