Well, this means you want to make money without work for it? Hard very hard!
The only thing that comes to my mind is building up a good amount of referrals for a profitable service, e.g. gambling sites, PTC-sites or various other Bitcoin affiliate sites. But you need to do much work at the beginning and it is not certain that it will work.
best way for steady income is to have a stable or regular job wherein you earn your your monthly salary. just enough to cover the monthly expenses.
but if you're married and have children work to provide stable income every month, sometimes not able to cover your monthly needs. so I think a stable income is not enough
Get food business this is i think can be passive income because people are always eating..
Or get learn many skills that you can offer by many people that i think you can use it forever that we can consider as passive income..