We flew last summer from Indy to Orlando, with a layover in Baltimore, 3 flights total. We had 2 adults, a 7 yo, 4 yo, and lap child. People had made us so nervous on here that they wouldn't do early boarding for families, that only one of us and the youngest 2 would be allowed during family boarding if they had it all, or some spiteful person wouldn't allow us to save seats if that did happen, and on and on. I was stressed for weeks. Ultimately, we took our chances on the way there and paid for early boarding on the way home, so I wouldn't have to hassle checking in at 24 hours. And honestly, all that worry was for nothing. We had B seats, but got on with family boarding (all 5 of us) both flights on the way there. On the way back, we had A seats from early check in, but even friends of ours (3 seats) who got on board almost last due to arriving very late were able to get seats altogether. I think you'll be fine no matter what you decide.