The situation you have described is indeed a challenging one, where parents are making significant financial sacrifices in the hopes of securing a better future for their children. The idea of children being seen as investments and having the responsibility to take care of their parents in the future can create immense pressure on both parents and children.
Setting limits on the amount parents can invest in their children's education is a complex issue that depends on various factors such as financial situation, cultural beliefs, and future expectations. However, it is essential for parents to consider practical financial planning and not jeopardize their own financial well-being in the process of investing in their children's education.
For me I think finding a balance between investing in children's education and maintaining financial stability is crucial. It's essential for parents to prioritize their well-being and financial security while supporting their children's educational pursuits.
I never feel the need to do anything beyond my capabilities in my real life. In that respect the investment for children's education and the financial capacity and stability of the family head should be balanced between these two. Any exception to this will threaten normal life. I don't mean to imply that as a family member I won't spend or invest in the OP's words for the children's education. Every person should have a good idea about money management then it will be easy for him to manage the country including his family. And if this education is imparted to the children as a family education in addition to institutional education it can be expected to pay off well.