Yes, there are ways to involve your kids in your family vlog without actually showing their faces. One way would be to have them contribute their thoughts and opinions about certain topics you may be discussing, or have them help you record and edit the vlogs. You could also consider recording activities that don't necessarily include direct video of your kids, such as having them help you set up and decorate the backdrop of your vlogs, or have your children contribute to the content in some other creative way.