Visa extension of kids turned majors after visa expiry

[vhd]

I had an overseas business representative visa which expired on June, which my husband and 2 children were dependents on. Prior to its expiry, we already put it an application for its extension. Unfortunately, the extension was refused, and its decision was released after our visa expiry. We now have 14 days to submit an AR or another application and we are planning to submit another application. I have a 2 questions which I will state below, as I am getting various perspectives from different solicitors as my case isn't very common.

1) I am planning on switching to a skilled worker visa in the grace period of 14 days that I've been given. When I had entered the UK, my children were minors but they have now turned over 18 at the time of refusal. When I put forward the application to switch to a skilled worker, will my children carryforward as my dependents even if they're over 18? They are currently in the middle of their university degrees.

2) Will my refusal on the extension of my overseas business representative visa negatively impact my application as a skilled worker, or will still be solely the matter of obtaining 70 points? It was refused due to the officer believing the company and documents were not genuine (there was a dating error but we are not trying to risk losing an admin review)