Why did Yosef use a different criterion regarding his father ("lest you will become impoverished"), than regarding his brothers ("because Hashem sent me to sustain you")?
Ramban: Although he was blunt with his brothers, hinting that without him they would have died, he did not want to say that to his father, preferring to use the milder expression of poverty that would be his lot if he remained in Eretz Kena'an.
Why did Yosef say, "I will finance you there" [i.e. in Goshen]?
Malbim: If you are in Eretz Yisrael, I cannot finance you, lest people say that I send money [or food] outside of the country. It is not disgraceful [for me to finance you here], for it is necessary! And so said Mahari.
Above (45:6), Yosef said "Ra'av... in which there will be no plowing or reaping." Why did he say here only "Ra'av"?
Ha'amek Davar: In Egypt, Yosef needed also to supply for the needs of slaves 1 and animals, as explained above (to 41:5).
There, he said that in famine years, the poor eat carobs and vetch, which are animal food in years of satiation, and the rich eat only grain. In Egypt, neither of these will grow in the famine years. (PF)
QUESTIONS ON RASHI
Rashi writes: "'Lest you become impoverished (Tivaresh) [-- you, your household, and all that is yours!]' - ... as in the verse, '[Hashem makes one] poor or rich (Morish u'Ma'ashir)' (Shmuel I 2:7)." While we understand how the term "impoverished" can be applied to people, how can it be applied to possessions?
Gur Aryeh: The term "impoverished" can in fact apply to slaves or animals; to mean that they do not have sufficient food for their needs. (We find in Devarim 28:42, that it is even used regarding [the yield of] trees.)
