Jerry Seinfeld’s children don’t think he is funny. The 70-year-old actor – who has Sascha, 23, Julian, 21, and 18-year-old Shepherd with his wife Jessica – has amassed great success in comedy with his classic sitcom ‘Seinfeld’ but admitted he “doesn’t want” his kids to think he is good and they are “used” to his jokes by now. He told E! News: “You don’t want your kids to think you’re that great. A lot of times if I try to be funny around them, they’ll go, ‘Is that one of your bits dad? Is that some new bit for you?’ They’re pretty used to it.” The stand-up star is even unsure whether any of hi…