Not on facebook so can’t look at that group
It’s a rear facing baby seat on one seat, then two older kids (6 and 7) on the other two boosters. Have a variety of booster options as we often give lifts to other kids and I bought a very narrow (but cheap and basic one) from amazon. Front seats reserved for adults, though if only 1 adult then 1 of the kids will be up front
That pic above is helpful to check where the seat belt is sitting. The problem is getting their hands down in between the seats to reach the seat belts. I had 4 kids in the car on the way back from cubs yesterday, my son and 3 others. The 3 others were in boosters in the back and I had to do their belts for them as they couldn’t reach down.
It’s an e class merc estate, it’s not as wide as a people carrier but it’s not small either. I am doing everything I can to avoid getting a people carrier!