My mother was a beautiful seamstress who also made Barbie doll clothes and sold them. She was very accomplished and I had the best sewing teacher around the entire time I was growing up and didn't care about sewing at all until I had children of my own and realized how fun it was to make matching outfits and such. My point is don't hold it against the teenagers if they have no interest (yet). I would hold on to those machines awhile until the kids are fully grown.