Make a game of practice casting. Go to the dollar store purchase 5 prize's. Now set up some buckets or simular targets put a prize in the bucket or simular object. Now have the kids practice cast and if they get it in the bucket they get the prize. This keeps there interest and sure helps them learn to cast. Makes it easier when your on the lake if they have a lesson in practice casting. Go to a park or area you'll have plenty of room.
You can join also and warm up the old arm it won't be long.
h2o<----don't use a lure use a sinker or practice plug.