Yes of course I can, because I myself follow the bounty campaign and everything I get is more than enough to meet the economic needs of my family, besides that the most important thing you should really learn about bitcoin deeper so that you will earn more than enough to meet the economic needs of your family through a bounty ...
Sustaining the needs of family? I bet no one can. Although, I am not sure where you are from, but one thing I can say is that you can only get something tangible from it in the short term even if you are doing majorly all the bounties, and personally, it is just a way I see one can invest in some valuable project for the longer term if you do not want go the cash investment way and except for that long term, I see no how anyone can easily do a bounty and expect to get monthly income to run the family needs.