A grandfather of one's spouse.

the name used for one's grandma

plural of grandaughter

Alternative spelling of granddaughter

A grandmaster, in some field, whose skills or accomplishments exceed those of other grandmasters.

Don't presume to give advice to those who are more experienced.

plural of grandfather clock

plural of grandfather paradox

The paradox of time travel in which inconsistencies emerge through changing the past.

plural of grandbabe