Charlotte, I'm sure the grands will love the sweaters. Mine seem to think anything Gramma makes is beyond priceless. Ugh, that can be a pain, GS outgrew his Xmas PJs with cars on them years ago and is still hoping I can make them fit again. Don't be too hard on yourself, you are making them with love and they'll know and feel it. Do, please, enjoy your knitting.
Happiness is catching that dropped stitch while it's still fixable..