Loralee, I am sorry... but they way things are going it sounds like they already know that they can take advantage of your husband, your daughter and yourself. It is very hard to get out of that pattern when it has been going on for a long time.
They are two solutions for you, If you don't have the backbone to stand up to them.. then sell the property and move away from those leeches. Or, if you can learn to stand up for yourself.. start by saying "NO". Every time they come ask for something..NO. Even if you can do it, even if you have nothing better to do.. even if they want your daughter.. or your husband to do something.. the answer should ALWAYS be "NO". After a long... looooong time of saying NO, and you feel very comfortable saying NO (no cheating, you have to really feel comfortable with the word "NO") you can start saying yes. Once in awhile, never two times in a row. If there is any decency gene in your inlaws DNA.. they will start appreciating you better.
Hey, the worst it can happen, is that they will NEVER ask for anything again.
D.