I think that you should just ‘bite the bullet’. I developed a bad squint, amongst other things after contracting polio as a toddler. It needed sorting asap just like any other sight problem. I had the operation- think it’s called ‘strabismus surgery’ . I’m sorry and surprised that your daughter isn’t more grateful to you for your efforts on her behalf. My Mum always advised me that good parenting meant that you risked being hated by your children because, sometimes, doing the right thing, the best thing, for your children is often difficult for everyone.,. Your daughter needs to do the right thing for her child just as you did. My Mum has been gone many years but I still give her heartfelt thanks for the years of time and effort she put in to dramatically alter the original prognosis she was given for my future - and not just for the squint. (Polio is the gift that keeps on giving ) Good luck. I hope she”s sensible and listens to you.
advice please DGS requires speech therapy


