For a show where nearly every everything is impermanent - from the death of a main character to that memory of that time we went to that museum/ fought that chicken/ etc - one of Family Guy's only real constants is the fact that everyone hates Meg.
But as Family Guy Season 12 moves to a close, the show seems to have decided, after over a decade of testing everyone else's limits, that its own boundaries are the ones worth pushing.
Which is how we ended up with Family Guy Season 12 Episode 19, a half hour devoted to Peter finally warming up to Meg.
Part of the joke that animates the core of Family Guy is the fact that, if real families acted as snippy and snipey as most sitcom families do, it wouldn't be cute - it would be an emotional nightmare of hostility and dysfunction (paging Modern Family!).