Not that your H is in the mental capacity mine was but I experimented with my response to H. He was pretty far gone but at times he did share things about the boys or himself with me. I was completely dark and pretty much ignored all his texts unless it necessitated a response only in regards to the kids or house matters. It pushed him away. He stopped sending things and got his head further out of joint if that's the nicest way to say it. when I responded he would go back with a conversation (albeit short) via text. I'm not saying this is what is right for your situation by just my .02
You don't have to pursue to respond. A simple 'how cute! Thanks :)' or something along those lines would be sufficient. You can try it and see what happens. If it pushes H further away or his behavior becomes distant then you know that doesn't work. My H said he felt like I was being cold when I flat out ignored to pictures or texts he would send. I wasn't in a place to respond or even try to be nice at the time. Sorry I'm rambling.
