You have to get people to add your to their Familia. I haven't figured this out yet either. I've posted request to be added but didn't get any help...Maybe try that and see if it works. If you have inactive people in your Familia you want be getting any thing from them.
Reward your closest friends by adding them to your Familia. Every time you win in a Fight, Complete a Job or Claim a Hitlist, your Familia Mobsters receive a percentage of your earnings! If a Mobster adds you to their Familia, you will receive a percentage of their earnings.