Award with Comp Cert Question

I'm looking at my options for some travel and I wanted to ask the Brain Trust some questions.

Facts: I have a family of 5. I'm PM, my wife is GM, 3 kids (ages 13, 10, and 6) are all no status but have miles. I have 560k miles, my wife has 58k, my son 53k, and the other two about 15k a piece. Looking at booking some award travel that costs 40k per award for our needed itinerary.

Here's what I'd like to do:

1. Buy two tix with comp cert; me and one of my kids
2. Use 40k of wife's miles for one of the award tix.
3. Use 40k of son's miles for another award tix.
4. Use 40k of my miles for last award tix.
5. Is it possible to then call PM desk or use @Deltaassist to join these 4 separate PNRs together?

Just trying to use up some of the spare miles from the less-used accounts. Pretty sure I can't do this, but thought I'd ask before doing it the normal way.

Thanks!