What is the longest word in the dictionary?

Can you decipher the below rebus?

PBLUESAISNUERSES

John is the son of Jacob.
So,
Jacob is the_____of John's father?

If two's company, and three's a crowd, then whats four and five ?

What does this below rebus puzzle mean?

This is a most unusual paragraph. How quickly can you find out what is so unusual about it? It looks so ordinary, you'd think nothing was wrong with it. Actually, nothing IS wrong with it. But it is not as ordinary as you might think. If you think about it for a bit, you will find out why it is truly so unusual. So what is it? What is so unordinary about this paragraph?

what does the below rebus means?

Until it is measured, not known. Yet how you miss it when it has gone. What is it?

You have four chains. Each chain has three links in it. Although it is difficult to cut the links, you wish to make a single loop with all 12 links. What is the fewest number of cuts you must make to accomplish this task?

You walk into a room and see a bed. On the bed, there are two dogs, five cats, a giraffe, six cows, and a goose. There are also three doves flying above the bed. How many legs are on the floor?