"Equalizing" the Oldest

I have to admit a special connection with my oldest. He is our only boy, and he's had my individual attention for so long. Because he is older, we can do more together. We love to wrestle, play basketball in the house, and talk about almost anything, and read about almost anything. Now, our middle daughter is starting to take off intellectually, and not even the baby wants to be left out of anything. My son is feeling the adjustment too. He is always asking to play basketball, etc. But some of the games we're used to are games the girls can't play yet, and they feel left out too. So, no matter what I do, someone may feel bad. I am still able to do some things that my son can do that the girls can't, but I have to explain to him more often now that we need to play games that the girls can play too. The hardest part is that they are all too young to understand what I'm trying to do. Maybe this is just one of those parental juggling acts that I can't manage all the time, but may some of the time. I guess in parental terms, that is success.