Leaving to Anchorage tomorrow. This is award redemption using AA miles and I do not have status with Alaska Airlines (I am Premier exec with United, but doesn't help)
Passengers: Me, pregnant wife (first trimester), six year old.
Outbound and Inbound has one stopover. For all the segments Alaskan rep I talked with offered the last row seats to all 3 of us together. But it will be very inconvenient since my wife is having nausea against smell. I am sure lavatory smell is one of those kind.
Is there a way that I can change our seats, so that we sit together?
Is the only option requesting the seat change at the airport?
Any tips or tricks to try doing online?

I tried to change on one segment for tomorrow's departure but couldn't get anything together unfortunately. Atleast I got 2 seats together and one behind that row and selected it. Now the last row seats I originally had is all greyed (showing not available). Why? I thought