(*ahem*) Do you mean a non-electronic upright piano? Grands are by definition horizontal, methunk.
Admission: our battered ol' upright is so down-at-string that it has effectively negative value. Quite apart from the missing note(s) and it being so out of tune that it's torture to play, the C-sharp below middle C has one string which refuses to stay anywhere near in tune with its mate. Its main purposes in life nowadays are to hold up family photos, absorb furniture polish, and eat Christmas cards.
Learn from our experience, Stilly. I suggest getting someone in to see whether it'd be worth getting your piano in tune, at least with itself, to help stop further deterioration.