[Avodah] A Question About Yitzchok Taking a Canaanite Wife

[Moshe Y. Gluck]

R' YL:
Did Avraham really think that if Eliezer brought Yitzchok a Canaanite woman
to be his wife that Yitzchok would have accepted such a Shidduch?  Surely
Avraham must have told Yitzchok that a Canaanite woman would not make a
suitable wife for him and surely Yitzchok, who knew the type of people that
the Canaanites were, would not consider a Canaanite woman for his wife. 

If this reasoning is correct, then I do not understand why Avraham made
Eliezer take this vow. Why not make Eliezer take a vow that he would take a
wife for Yitzchok from Avraham's family?
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Because Yitzchok had no idea who his relatives were or what they looked like
(this was before Skype). So Eliezer could have picked a random Canaanite,
schooled her in the right behavior and/or language and/or genealogy, and
passed her off as someone from Avrohom's family.

KT,
MYG