Because he's always 'spotted'.

Monkey see monkey do

Because he wanted to have sweet dreams.

A pillow.

Oliver was born on March 1 on a plane flying eastwards over the Pacific. A few seconds later the plane crosses the International Date Line, and Olivia is born. She is thus born on February 28, making her the ‘younger’ sister with a calendar birth date one day before her brother’s. On leap years, however, Olivia will celebrate her birthday two calendar days before her older twin.

The question talks about great grandchildren, not great-grandchildren. The hyphen makes all the difference. The grandchildren were great, top, brilliant and awesome, but childless.

Facetiously.

startling - starting - staring - string - sting - sing - sin - in - I.

888 +88 +8 +8 +8 =1000

THOROUGH --> THROUGH --> TROUGH --> TOUGH.

Nothing.

None. A hole is empty.