I am flying MME -LHR on BMI as a UA codeshare then LHR-LAX on UA on a B ticket.

I presume I need to use check in desk as I have a UA confirmation/ticket?

On UA B is E+ is B on BMI standard econ or premium?

As a *G can I bring my wife (no status - (*A that is) and teenage daughter into the lounge?

Thanks for any info - call centre in India was totally useless.