Try writing stories about your ancestors, or try writing your guesses about them to supplement what you learn. Try scrapbooking for art, or doing a study of the countries your ancestors came from. Trying learning the language of your ancestors. Hold birthday parties to celebrate the birthdays of your ancestors. Remember to count the time spent researching as school hours.
Research is an important skill in every subject.
The trick to expanding it is to learn about the times and places your family came from. Make a page for each family. Write everything you know about them, and then learn about the time and place in which they lived. Have children write about the foods, the schools, the lifestyles, and the current events of the time. Have them draw pictures of the clothes and homes.