grandchildren

American Sign Language:
grand http://commtechlab.msu.edu/sites/aslweb/G/W1490.htm
children http://commtechlab.msu.edu/sites/aslweb/C/W0620.htm

English:
grandchildren

French:
les petits-enfants

Italian:
i nipoti

Spanish:
los nietos

Swahili:
wajukuu