Is it right for in-laws to see their grandchildren?

When you say looking after grandchildren, you mean taking care of children, right? There is no legal support for this problem. There may be such a custom in some places. Grandchildren are all watched by grandma. But if grandma is really in poor health, or doesn't want to see it, can she not be forced? Therefore, it is better to discuss this matter with each other, and don't force the elderly to do things they don't want to do.

On the other hand, most old people dote on their children, ignoring science and sometimes hygiene. Nowadays, young mothers are literate, and most of them don't like the way the elderly take care of their children, which is easy to produce contradictions. We might as well find another way. For example, bring it yourself, or let grandma bring it, because mom and grandma are mother and daughter, so it's easier to communicate.

If you are talking about visiting your grandson, both sensibility and rationality are fine. It is inhuman not to show your grandson to your mother-in-law.