Says it in lots of places:

*"Do you think that I have come to give peace on earth? No, I tell you, but rather division; for henceforth in one house there will be five divided, three against two and two against three; they will be divided, father against son and son against father, mother against daughter and daughter against her mother, mother-in-law against her daughter-in-law and daughter-in-law against her mother-in-law.” *

Luke 12:51-53