Antique pitcher

Your milk pitcher looks like Jasperware, but it appears to have a glazed finish. The figures in high relief are representative of early potters attempts to copy Chinese porcelain. Because of the glazed finish (unless that is just from camera glare) and what the chip in the spout seems to reveal, this may be early soft paste porcelain and possibly from a German or Alsatian pottery. Alsace Lorraine at the time your ancestors emigrated was in France. (I am also of Alsatian heritage and my ancestors   arried in the late 1700's as well.). However, Alsace borders Germany and many inhabitants in the late 1700's were German. The upper Bas Rhin region of Alsace was known for its potteries for centuries. If the pitcher has been in your family for several generations, it's possible your Alsatian ancestors brought it with them. Because pottery was actively imported from Eourpe in the early 1800's, they also could have purchased the pitcher here. I don't know enough about this kind of pottery to offer a credible value. Hopefully someone else will be able to.