It seems from the language of the Rashbatz (in the Haggadah): "And if the Holy One, blessed be He, had not taken our ancestors out of Egypt, then we and our children and our children's children would still be enslaved to Pharaoh in Egypt. And it would be fitting to say all this only at the time of redemption for those being redeemed, but we have not seen the servitude and have not been redeemed, therefore we say to him now, that that redemption was also for us, since if our ancestors had not been redeemed, we would still be enslaved to Pharaoh, so that redemption was also for us and it is fitting for us to make these changes. And so it says in the Haggadah, in every generation, a person must show himself as if he had come out of Egypt, and as if he had been redeemed, as it says (Deuteronomy 6:23), 'And He brought us out from there, to bring us and give us the land that He swore to our ancestors.'" From his words, it is understood similarly to Rashi's interpretation, that his redemption is dependent on the redemption of his ancestors.