You have to book each companion cert on a separate reservation. One adult, one child on each one and you should be good to go; ask for them to link the PNRs.
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The Mileage Plan™ member who owns the companion fare code must either be one of the travelers or the purchaser of the reservation. If the member is allowing two travelers to use his or her companion fare code, then the member's name must match the name on the credit card used to purchase the reservation.
The Companion Pass is valid for travel only when the Companion is accompanied on his/her flight(s) by the Rapid Rewards Member. When you add a companion to a Southwest reservation, your itineraries will be linked.
One of the strictest Delta Companion Certificate rules is that travel for any companion pass must be booked and completed by the expiration date listed on the certificate. Note that its validity is not based on the calendar year.
After you set your initial companion, you can change it three times in 2022 and then three times in 2023 — if you earn the pass in 2022. This means you can have up to seven different people fly with you on the pass over two different calendar years. You can also pick a person as a companion multiple times.
Bottom Line: The Southwest Companion Pass allows you to add a companion for just the cost of the taxes and fees ($5.60 one-way on a domestic ticket) to any and every flight you take while you have the pass. It can be used an unlimited number of times and works on tickets purchased both in points or cash.
If you have one of these accounts, the second person you book, using your companion voucher, has to be named within your Household Account or on your 'Friends and Family' list. You can however use Avios that one household member has earned to spend on flights for another member of the Household Account.
You can use two Companion Vouchers at the same time for a group or family of four if you accrue two Companion Vouchers across two card years and book and take your outbound flight before the first Voucher expires.
Companion tickets are not transferable once issued. Companion Certificate and Delta eCredits can be combined in the same transaction. Delta eCredits can be applied as payment toward cost of the primary ticket, companion ticket, and any government-imposed taxes and fees.
Allianz Global Assistance defines a travel companion as “a person traveling with you whose name appears with yours on the same trip arrangement and who will accompany you on your trip.” (A group or tour leader doesn't count, unless you're sharing a room.)
Traveling alone undoubtedly gives you more freedom. You are able to do what you want when you want, and you also have the increased opportunity for unplanned spontaneity.
You still must travel to one of the 48 contiguous states, and the address in your Delta account must be from one of those areas. Companion tickets can be transferred, so you can book for someone else, but once the ticket is issued, it's not transferable.
A Medallion Member and one traveling companion may both enjoy a Complimentary Upgrade when traveling on Delta and Delta Connection carriers, as long as that companion is a General SkyMiles Member, Medallion Member, or partner airline elite member*, and traveling on the same flight in the same reservation.