A quart is 2 pints. A pint is sixteen fluid ounces of water and weighs about 16 ounces (avoirdupois weight.) A gallon is 4 quarts (8 pints) and thus weighs about 8 pounds. Five gallons would be about 40 pounds.
In some cases, if your mother is on Medicaid, she can designate you as her personal home care aide and you can get paid a small amount through Medicaid. If your mother has her own resources, you can draw up a contract agreeing to work as her home health aide and she can pay you a salary that you both agree upon.
Is it true that social security (Federal Government), will pay you, in order to take care of your elderly parents? I took my 83 yr old mother to her hair dresser a few days ago, and a woman who works there commented that I should look into social security paying me, for taking care of my parents..