Help! So I have a 21 month old about 24 pounds and about 32 inches tall in a graco 4ever dlx rear facing. A 3 year old that is roughly 37ish inches and 37 pounds ( on the small side) in a cosco finale 2-1 harnessed. And a 5 year old that is 43 pounds and about 43ish inches tall also in a cosco finale 2-1. However, the 5 year old is getting close to maxing out her current seat. And I need 3 across in a 2007 Toyota Camry. The 5 year old is booster ready and sits maturely during the entire ride. I am open to a convertible seat for the 3 year old to put him back to rear facing.