To participate in Bitcoin investment, you definitely need real income, because if you cannot meet the basic needs of your family, then how will you participate in Bitcoin investment.
When you are planning to invest in bitcoin, then firstly make sure your secure a stable source of income, if you don’t have a reliable source of income, after investing in bitcoin, time will come when you will end up selling your bitcoin investment back gradually, if you don’t have a stable source of income, then you won’t be able to hold bitcoin for long time, because whenever their is any problem, then you will end up selling the bitcoin just to solve the problem at that particular time.
If you are planning to invest in bitcoin, have a source of income which you will be using to take care of your daily needs, and you will be using some to invest in bitcoin, make sure you are having emergency funds, whenever their is any emergency, you won’t have to sell from your bitcoin, you will be making use of the emergency funds.
You don't have to have a stable source of income to invest in bitcoin... but you do need to have discretionary income to invest in bitcoin. If you do not have discretionary income and you buy bitcoin then you are likely gambling since by definition you are using money that you need for expenses.