I'd tell her that we have actual tickets for games on Mar 9 (Astros) and Mar 13 (Indians), but otherwise just plan to buy the day of the game.  We just pulled schedules from the web.

My feeling is that once they affirmatively decide they are going to FL, you should say that I rented a house and that you are going to come over and stay with us for a few days.  I know this might push us to the point of her asking whether they can stay with us .... but I'm afraid the kids will spill the beans.
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