N parents (58/60) keep trying to go on double dates with my brothers (28) coupled friends

Its weird. It started with them both being invited to my brother's best friend's wedding. The couple live in another country now but whenever they are here, they pop round to our house and say hi, which is ok, but my brother no longer lives here. As a consequence of this, my parents keep asking them to dinner "next time they are here" as a four, which doesn't sit right with me. Just this evening my N/E father said he liked another one of my brother's friends and that his girlfriend seems nice and they should ask them to go to dinner (as a four, no mention of my brother being invited). Being the Scapegoat of the family, of course myself and my boyfriend are never invited out by my N parents, but I'm not sure if that is what is bothering me here lol.

Any thoughts?