Back in the days Chicago's main goals were to inflitrate political positions and to infiltrate all lucrative legitimate enterprises. Thats why they very rarely made their sons or nephews but instead they gave them legitimate operations from which one part of the income went for the organization. Also, they began making less members, which confirms their real goal. According to sources from that period, some of the bosses didnt want the same faith for their blood relatives and close family associates, meaning they didnt want for them to be involved in the "life".
Today we have lots of blood relatives and family associates in Chicago who control numerous legitimate enterprises, previously received with the help from their old time Outfit connections.