I want to fly my kids to visit their grandparents. They are too young to fly as unaccompanied minors.

Ideally, I want to be on the same itinerary as they are - we'd all fly like this:
Itinerary A: February 1 - MSP-XXX, 3 passengers
Itinerary B: February 2 - XXX-MSP, just me
Itinerary B: February 14 - MSP-XXX, just me
Itinerary A: February 15 - XXX-MSP, 3 passengers

I feel like this might be considered against the rules, though I'm not doing this to get a cheaper ticket, I'm doing this because I want to be on the same PNR as my kids (I've had issues when we've been split in the past). Is there a way that Delta will allow this? Perhaps by using an alternate airport (for example, MDW vs. ORD on itinerary B)? Would calling in and paying a phone charge help?

Thanks.