The best replacement for grandson is great-grandson.

The best alternatives to grandson are rated as following:
★★★★★  great-grandson
★★★★★  nephew
★★★★  great grandson
★  grand-son
★  grandmother

Your alternative for grandson is not listed? Suggest!
Speaking about grandson, one probably shouldn't forget about grandmother.

Other search terms related to grandson and their ratings are:
★★★★★ grandmother
★ baby grandmother
grandma
You have in mind a companion for grandson and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of grandson in all years. Click on graph for more.
grandson
great-grandson
nephew