I don't know what anyone else thinks mate but I would advise not to get too many to start with, a couple will yield up enough meat to feed a family for months.
Learn all their funny traits and all the various methods they have to escape and it's easier to catch 2 than it is 6 when they decide to go for an explore.
Get them used to you with a bucket of grub and leading them around is easy.
Pigs are bright and good fun and they are like naughty children......so start small would be my advice.
Cheers for the advice mate,
I know the biggest problem will be the kids (and the mrs) becoming to