Like what you've mentioned, my friend had a car seat on either side (she sits in the middle). She doesn't have a helper though. I guess you can get your helper to sit in the middle if she is the one tending to your children?
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For me, i got 4 kids and i don't use car seat at all.
My kids are 8 yrs, 5 yrs, 2 yrs and 8 mths old.
Currently when we go out, we r in a sedan car with mummy and the 4 kids behind.