My mother-in-law will go back to her hometown to do farm work, and no one will take care of her children.

Generally speaking, young people should support what old people want to do. If the child really needs her mother-in-law, she can discuss it with her mother-in-law in a peaceful tone. After all, it is not her obligation. Even if the mother-in-law disagrees, don't take it to heart, which will have certain adverse effects on yourself and your family in the future. Taking care of children is a mother's bounden duty. Try to take care of yourself or yourself, so that you have a better sense of intimacy with your children. If there is really no way, if the economy permits, you can also hire a nanny, or send your children to a nursery or other institutions. My mother-in-law has worked hard for her children and grandchildren all her life, and the income from going home to do farm work will not be yours in the end, will it? As long as you think on the bright side, there will be no bad thoughts that will affect the life of a family. I hope my answer can help you. If you still need to ask questions, you can continue to ask questions.