We want a large family and have looked at the Joovy stroller that can be a 1-3 kid stroller. It has a bunch of attachments that unfortunately have to all be purchased separately but most strollers are like that now. It’s not the cheapest option but it’s also not the most expensive.
A lot of strollers have adjustments that you can add a second part If you have another child they are a bit pricey tho but I suggest getting one that the tires are big enough they don’t get stuck easily an to have a foot undercarriage space for all the stuff you’ll carry with the kiddos because there’s always a lot to carry I’ve learned that from experience you wanna be able to fit your diaper bag down there so you don’t have to hang it on the handle