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We are expecting number 3 and would love to not have to buy a new car. We just got this car last year. We currently have a 2 and 4 year old in Cosco Scenaras. The 4 year old is almost at the weight limit and will need a new seat in the next few months. Is it possible to fit 3 across in a Mercury Mariner? And if so, can we keep the two cosco scenaras, one for the 2 year old, one for the new one, and then get a new seat for the four year old? If so, which seat would be the best? We want him in a 5 point harness as long as possible. Thanks!