At first, your family, especially the elder ones, would think that you might be playing games or watching movies if they see you using laptop or computer all the time, but if you show them that you are earning money from the time you are spending then it becomes understandable for them and then they would never say anything to you regarding it.
As for the extended family, you don't need to tell them anything.
I agree with this… I think that income is personal and they have the right to privacy and they do not need to tell their family about that income. Even when you are a student, when you go to work, when you have a family, I think it is right not to disclose your income to your family or relatives. Sometimes when you encounter difficulties, you share with your family, that is natural?? But the issue of sharing income with family and relatives should or should not, there are many problems that can arise. There are people who will use income as a measure to evaluate you and your family - I have met them and it has caused many conflicts. So, for me personally, I do not share.