Premise:
"my oldest is uh four and my youngest is about to turn three"
Hypothesis: My oldest child is Vanessa, she is four and my youngest one is Brad, he will turn three in september.

it is not possible to tell

Premise:
"Together, we can make the world the better place it was supposed to be."
Hypothesis: There is no hope for the world.

no

Premise:
"21 Mr. Inglethorp was in the drawing-room when I came down to supper. "
Hypothesis: Mr. Inglethorp was asleep in the drawing-room
it is not possible to tell