How can I use sticker charts / other intervention to help one child change behaviour without impacting on other siblings? When dd1 was 6 we gave her stickers and a small treat to stop sucking her thumb - worked brilliantly, stopped within a week and never sucked again. Except dd2 (then 4) started to suck her thumb having never sucked it before. We had given her stickers for something else - can't remember what now, but she just seemed to see it as more reason to start less desirable behaviours. She has also done this at school - misbehaving then being good to get rewards from the teacher, until she told me her plan and I spoke to the teacher.
Now I really want dd2, 6.5 to stop before her permanent teeth come through, but don't want ds to start. She also needs to put more effort into reading- e.g. reading when asked to rather than being nagged and looking at the book rather than the ceiling. Ds however begs to read and will read up to an hour a day - I know it might not last but I don't want him to think that by protesting he will then start getting rewards for behaviours he previously did willingly. Don't get me wrong ds isn't a perfect child e.g. he could try not to get so angry and frustrated but if I reward him for that I think it is unlikely that the older girls would start.