According to GRRM, yes.
You know… this always seemed a little weird to me.
I mean, yes, Walder Frey has been looking for a chance to stab the Tully’s right in their face for a long time, and the Starks and the Tullys are bound closely together… but I’m trying to figure out what Walder would be so kindly disposed to the Lannisters.
Because Tywin slighted Walder big-time. Tywin stood up in front of half the west and called the marriage between his sister and Emmon Frey a mistake, a marriage that was beneath her dignity as a Lannister. And he did it as a ten-year-old. That must have been super humiliating, and Walder never forgets a slight.
I can only imagine that later on, when Tywin became Westeros’ number one war criminal, Walder looked at him and sort of grudgingly decided “yeah, okay, I like the kids style.”
Oh, Walder Frey still resents Tywin for his slights – hence why he insisted on Lannister-Frey weddings as part of his quid-pro-quo – but I think at the end of the day Walder is as much a pragmatist as a revanchist and he thought the architect of the Rains of Castamere and the Sack of King’s Landing was going to win the war and wanted to be on the winning side.
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