Registered association Petter ja Elisabeth Hällström sukuseura ry was established 1969 in Ilmajoki.  Very important person, in starting the co-operation of the family, was the bank inspector  E. Sigfrid af Hällström who personally made research with the Skone background of the family. At the moment there is about 2000 members in the association.

The association has its own family sign which has been designed  by Heraldist Gustav von Numers 1977. The association table pennant, the family pennant flag and the bronze family shield designed by  sculptor Lauri S. Ketola were published in the family reunion in Virrat 1988.

The association continues the family research and the related historical research. In each family reunion will be published a festival booklet in which can be found complementary family information of the festival town. The association is lead by the family board having 15 members.