My brother has his kids every other weekend and this is his weekend! My older son, Levi, is 5 years old, as is my brother's oldest son, Caleb. ALL day, I've heard, "when I see Caleb this weekend I'm gonna show/tell/teach him this", "I can't wait to see Caleb", "How many more hours until I can see Caleb, mom?". It's so great to know that he has such a good friend and that he will have soooo much fun tomorrow :)
Do your kids have any family members close to their age? Have they formed close relationships with them?