Debbie,
You may have inherited a valuable antique concertina. The Wheatstone Linota is one of the most sought after concertinas ever made. Many prominent musicians regard them as simply the best ever built.
I would recommend that you have it looked at, by one of the reputable shops listed on Concertina.net. They can both appraise and repair it, if needed. Then, I would second Jim Lucas' advice and learn to play it!
Tom Scott