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Several things:
– You obviously need an adult to stay with the small child no matter what.
– Alaska not only doesn’t split PNRs unless asked, but if there is only one seat available you + your companion will be skipped by people lower than you on the status list for upgrades who are singletons.
– Not all fares are eligible for instant upgrade.
Check below:
All told your strategy is either:
Buy a more expensive fare to get 2 of you into Premium and upgrade the third, or probably waitlist 1 parent and child for Premium and First, and whoever “wins” the upgrade gets to care for the child.
Best of luck!
aa.com
AAdvantage status benefits on Alaska Airlines − AAdvantage program − American Airlines
AAdvantage status benefits on Alaska Airlines − AAdvantage program − American Airlines