If your kids are not so good Islamically, be afraid for your own soul. If you're living as a true Muslim, not a perfect one, but a trying one, then everyone sees it in your manners, speech and behavior. You're not yet saying a word to anyone, but you're giving da'wah. Knowledge of Islam is not to be measured in how many du'as a person knows or surahs memorized. Even parrots can be taught to say surahs but no one puts kufis or hijabs on their feathered heads.
Islamic knowledge is displayed in what no spoken word can say.
If you're around a good-hearted person, you can feel it. You want to be around that person more and to do what they do and to be like them. Eman, goodness and wisdom emanated from him. Think of people in your life who had these qualities about them. One student told me his grandfather was the sweetest Muslim ever.