I live in NCL, my dad in BRU. He will fly BRU-LHR-NCL-LHR-BRU.
At the end of his visit I will book a NCL-LHR-NCL flight(avios) and will show him LHR.

Now my question. Can I guide him into lounge me being on NCL flight and him being on BRU flight?

I am silver and we carry the same name.

Why would |I do this? we are both geeks and spotting whilst eating curry and slurping booze is our idea of a great day out.