My sister has 3 children and her SIL has 4. They often meet up for days out together and have started to refer to their "massive broods" whenever either of them post pics on social media 
a) 3 or even 4 kids of your own is hardly "massive" - 3 kids is pretty standard and 4 is more than average but not massive FFS.
b) "brood" is just wanky and crass. They're children not chickens. Fuck off and sit on some eggs if you want a brood.
Her SIL is quite wanky overall tbh, into some niche toys and clothing brands that she is always tagging and banging on about how the children are in matching clothes, so I think this idea of having a large family somehow ties into the lifestyle she aspires to if that makes sense. But seeing "massive brood" every time they share pics of their not-very-notable number of kids is doing my fucking head in!
Disclaimer - yes I do have bigger things to worry about and no I don't hate my sister, I'm just having a minor vent on a forum designed for that purpose.