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I just reverted back to BBX and foldable seat from the Bullitt Canopy with new seats with 5 point harness. 3-year-old and 1-year-old didn't get along in the canopy and couldn't fit while they were both wearing helmets.
I also saved around 7 kg going back to BBX-solution.
Keep in mind there won't be much room for luggage with two kids in the front.
And three kids and a dog is going to be schlep without e-assist.
How big are the children? Beyond 5-6 I'd say they start to outgrow the various bullit kid carriers available, though someone else on here might prove me wrong.