What a nice find! There's quite a lot of info on player-pianos on the net - Ian McLaughlin's 'Player Piano Page' and the UK 'Player-PIano Group' are both excellent sites for starters. I know nothing about Chilton pianos specifically - but the fact that it has an Aeolian player action is good. These are well built, perform well and are (relatively) easy to restore. Regarding value - unless it's a famous make - eg. a Steinway, or has a 'reproducing' player action - ie Duo-Art, Ampico etc - then it's unlikely to be worth a great deal in monetary terms.
You state that your family has no piano players - I'd have thought that was the whole point in having a player-piano - you don't need to be able to play! The player roll plays the correct notes - you provide the expression by use of the levers and varying the degree of pedaling.
If, as you say, it's in such great condition - why not put that cabinet of rolls to good use and play them. Failing that, new piano rolls are still available - covering most styles of music. So unless you desperately need the space (or the money!) I'd suggest keeping the piano and discover it's true value - which is the enjoyment you'll get from playing it!