have three spg and marriott accounts you can use. wife, kid, yours, friends, etc. doesn't matter who as long as they let you move points through it.
buy the max amount of SPG at 50% bonus for all three accounts. this will cost a total of $1,595.
transfer all those points to the applicable marriott account.
move the other two marriott account points to your own marriott account. marriott allows this.
use 270,000 Marriott points for Hotel + Air Package 3 (7-nights at a category 1-5 Marriott + 120,000 Southwest Rapid Rewards points)
even if you don't use the 7 hotel nights it pays off. you'll have the companion pass and 120k SW miles (120k SW miles can be redeemed for about $1,800 in travel plus you'll have the companion to add to all of that travel plus whatever other times you fly SW plus you'll have those 7 nights of hotel if you can use them plus you'll get points for that $1,500 in spend at the beginning).