Some people understand money more than they understand convictions. So when people begin to tell me that I need to get a job (this is usually my Mom to start with, then her telling others, and it really gets around) I just give them a quick money lesson.
I can get a part time job for about $7 an hour. It would cost me, with gas, food, and car upkeep, not to mention work clothes and other necessities, $15-$20 a day for work (this is based on my last part time job), I got paid "gross" about $28 a day, so once I deducted taxes and all the stuff they take out, I end up with about $5 a day for all that hard work. And, for me, $5 a day does not cover what I miss with my family.
Then, if I am talking a full time job, I have to add in daycare. I have one completely disabled daughter, one two year old, and one five year old. (I have other older children, but these three would have to have constant supervision. I would have to take some of my DH's income to add to my own just to pay daycare. (Not sure of the prices anymore, but it is not cheap.) If you look into daycare and price it, then figure out what you would make at minimum wage (because face it, most part time jobs are not going to pay much more) deducting taxes and work related expenses, you will have a good comeback for any persistant person.
In addition, if they say something like working during DH's off time, I tell them that our relationship is much more important than a few extra dollars that a part time job would bring in.
My Mom is the worst. She thinks I NEED a job just to get away from my children. She cannot understand that I actually ENJOY being with my children all day long.