Grand means 'big' in French. You've spelled it correctly in the question, good job! If the noun 'grand' is describing is feminine, make sure to add an e at the end! (grande)
grand- pere
grand-mère
grand is large in french.
grand grand père
Grandma in French is spelled "grand-mère."
Grand-père
Plus grand
In French Canadian, "grandfather" is spelled "grand-père."
grand-père(familiarly granpapa)
ma grand-mère
the largest is 'le plus grand / la plus grande' in French.
vraiment grand(e) et ensoleillé(e)