It’s not 100% guarantee they will give him a PRRA it’s all depends on officerYes you should attend it to avoid problems, but why they called you ?
Don't stress, they will discuss abt your problem and the removal order, you can ask for a stay of removal because you have an h&c application, you have also the right to apply for PRRA when they will ask you.
they will give you all your options , be sure that you will find a solution.