I like that last statement, if you give them idea if how much you are earning then the obligation for paying bills will be the next thing that you'll see coming, if they have the idea then they will put more for your monthly or sometimes even the daily as you are in the house and they'll think that you need to help, sometimes it's best not to let them know and just give whatever you can afford to help, in terms of other concern it will be on you if you want to share and if how vocal you are from your family.
I don't think lying about the actual amount someone is earning, either weekly or monthly, will stop your family from billing you. It would be better for them to know how much you are earning, and then you can try to support them with whatever is possible. That should be for close family. As a married man, you know it is your responsibility to provide what is necessary for your family, like food and shelter.So, as a man, you don't need to lie to your wife. What's important is that you always have your calculations ready. When the end of the month arrives and you receive your salary, always try to buy the necessary things needed in the house. By doing this, I believe it will avoid further billing.
As for other family members, what you have is what you can support them with. Anyone who bills you unnecessarily, you can simply tell them you don't have it, and that's all. Don't try to impress anyone, because most people that all family members focus on billing are those who always try to please them by giving whenever they ask. But if you keep saying you don't have it when they bill unnecessarily, they will eventually stop demanding from you.