Within USA Rejecting offer from Employer B after H1 & H4 approved

I have H1 B & H4 Visa stamped for Employer A and currently working in USA. I got from offer from Employer B which I accepted and Employer B filed H1 & h4 transfer and new petition is approved. Now due to new circumstances is it ok if I reject the offer and decide to continue with Employer A. Does any impact on me & my dependents in future for stamping and visa related issue?

  Did I need to apply anything for my dependents who are on H4 for status change?

It is ok, you can reject. But make sure your payroll is running and your status is legal

You can talk to your present employer about the situation.