@pratverd Seems like you are talking about the legacy input controls, which have always been experimental and have been deprecated since version 8.3. In the new controls, there is no need to set up a parent-child relationship - left-to-right chaining is enabled by default, which would mean (in your case) selecting "lemon" and "orange" in control 1 would make it so that only "fruits" is available in control 2.
We don't currently have the option for right-to-left/bi-directional chaining - this means that, if you select "fruits" in control 2, all options will still be available in control 1. Here's a link to the feature request for this - if you feel like this would be a useful feature for your use case, feel free to leave a comment on that issue so that we can track user requests 