Or HaChaim on Genesis 47:7/אור החיים על בראשית מ״ז:ז׳

1 ויעמידהו לפני פרעה, and he presented him before Pharaoh. The reason the Torah chose the word "ויעמידהו" may be that Joseph placed Jacob in the place where he himself would normally stand when he had an audience with Pharaoh. This may have been an elevated spot only lower than Pharaoh's throne [compare 41,40 where Pharaoh reserved only his throne as beyond Joseph's authority].

2It may also mean that he placed Jacob immediately opposite Pharaoh so that his father could bless Pharaoh.

3We have a tradition that Pharaoh was of extremely small stature so that unless Jacob was directly opposite him he could not have known that the person he faced was Pharaoh (compare Moed Katan 18).