One has three letters in the word three has five letters in it five has four letters and four has four letters in it (if you try more numbers they will always come back to the number four: so four is the magic number)

A Pig.

NO since she is a ‘widow’, the guy’s dead!

Cross your arms before you seize the ends of the string. Uncross your arms and it will tie a knot!

Thunderware.

The difference in age is 23 years, so I must be 23 if my father is twice as old as me.