The only person I know with hearing aids is my Mom! You can't even see them and they hook over her ear. But she did mention to me that sometimes when she takes her glasses off they will get hooked on and pull off. I told her I was going to give her some glue dots to hold them onto her ears, hehe.

If the little girls hearing aids are almost invisible like my Mom's the other children probably won't even notice them. But I would be afraid they would get lost in the grass and we would never find them again because they are so small. So ask the parents lots of questions and I'm really happy they are going to give you a 'lesson' so you know how to handle all the situations. I'm sure everything will be fine.