It sounds like you may have to bring activity to them. What about having a regular family game night, do something like bake and have the neighbors over. A lot of times, if you ask sedentary people to do something, they will say no because the effort seems like too much bother. Work on getting them to sit out in the yard if the weather’s nice—perhaps have dinner outside, or turn the radio, fix a pitcher of lemonade, and sit out there and read. Or do a little gardening, and get them to come out and supervise.