In the Haggadah, we read that Ya'akov Avinu descended to Mitzrayim 'compelled by Divine decree.' Most understand this to mean that Ya'akov understood that his reunion with Yosef would begin the fulfillment of the prophecy to Avraham regarding the centuries-long exile and oppression of Bnei Yisrael.
When his sons meet Par'o, however, they speak as if this was to be a short-term stay (until the famine was over when they could return to K'na'an and its pasture land).
Were they 'out of [or not yet in] the loop,' or looking to avoid overstepping Par'o's hospitality, or just being disingenuous?*