Genesis 16:1-16, 17:18-20, 21:8-21, 25:12-18
By many people's way of thinking Ishmael should not have been born. Abraham and Sarah (Ishmael's mother's mistress) choose to figure things out themselves and thus Ishmael was born. For this reason many people would not think Ishmael was entitled to God's blessings. But God doesn't work this way. Number one, God doesn't punish us for someone else's sin. Therefore Ishmael should not have to pay the price for his parents' bad choices. Number two, God keeps His promises even when we mess up our end of the deal. God had promised to make a great nation of Abraham's seed (child), so in Genesis 21:13 God tells Abraham that He will make a great nation of Ishmael because he is Abraham's seed.
Ishmael grew up in Abraham's home until Isaac was a small child. He was then sent away with his mother at Sarah's request. (He was probably between 15 and 17 years old.) We are told that he became an archer (Genesis 21:20) and eventually settled East of Egypt. In Genesis 25:17 we are told he lived to be 137 and that he had 12 sons (princes). He is the father of the modern day Arabic people. He did become a great nation just as God promised however as Genesis 16:12 tells us, he and his descendants didn't get along with those around them. This is the beginning of the conflict we see today in the Middle East between Arabs and Jews!
Make enough cards so that there are 2 card for each person. You will need a small candy like M&Ms or fruit like grapes. On one card write promise and on another card write sin. Leave the others blank. Pass out the cards so that everyone has 2 cards. Whoever has the promise card gets 2 candies the person with the sin card doesn't get any and everyone else gets 1. Keep playing until someone gets both the sin card and the promise card. Remind them that God keeps His promises so they get 2 even though they deserve not to get any! Keep playing as long after that as the candy lasts or everyone gets bored!