DH has somewhat of a dirty mouth, but yesterday he crossed the line. Whilst we were talking near DS4 and DD6 he said something to the extent of "F**k that". I don't know if they heard it (neither seemed to react much) but I don't want him swearing in front of our children... But when I asked him to not curse near the kids he blew me off and said it wasn't a big deal and that I should "just tell them not to say it". Am I being unreasonable here in asking that he not curse near our kids?