Thanks for all of your help so far. Here is my plan if you see a not so great idea please let me know.
6yo is getting a new booster, Parkway or Recaro whichever fits in the car better. My only hang up is his seats don't have latch so I'll have to figure something out with that. 10 mo will get his Marathon until December at the very latest.
While I'm picking your brains I figured I might as well ask about my DS. She'll be 4 in Oct., 37 inches, and 28 pounds. She's currently in an Alpha
It's time to be replaced. If you are counting this is the 3rd seat that needs to be replaced. Yes, I do get excited about buying new car seats, but the reality of the dollars is starting to chase the excitement away. Anyway, I was thinking about passing DS Nautilus down because it should be her last seat in that case. Then I could buy him another booster. Since those are cheaper than another convertible. I don't want to sound like I'm just thinking about money, but if she is just as safe in a Nautilus than another seat why not??
Then my 3rd seat goes to the 10mo in the second vehicle. I was going to go with another Marathon, but the Radian seems like it would be another seat that he could use forever???