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.
Other mom tasks include serving as a chauffeur, cook, nurse, homework helper, accountant, and private detective (necessary to find out what the kids are up to, of course). When all the numbers are added up, the total comes to $65,283.81. Well, maybe that sounds about right for what your mom is worth.