I'm going to have a 1.5 year old and a newborn. Can anyone suggest a good double pram? Or travel system?

With my son I had mothercare journey, which was a 'pramette' so it converted from the 'pram' to the 'pushchair' seat. Maybe I'm not looking right but I wanted something similar that converts but can't find it...otherwise do you buy the pram and then the seat attachment separate for when they grow out of the pram part? Silly question but I have no idea!! 🤦🏻‍♀️😂 Son now has the Joie 360 car seat so I only need the 1 carseat for newbie, I feel completely lost. Thanks for any suggestions you might have!