I lied a lot when I was younger, still do sometimes now. Literally knowing it’s an obvious lie, but did it anyway. I would take things from my sister, get caught, and deliberately lie to my parents face knowing they know what I did. It was very hard to deal with and I’m sure it was 10 times as hard for my parents since they didn’t know why I was doing this.
I’ve noticed the quote, “Idol hands are the Devil’s playground”, to be far too true for a child with ADD/ADHD. A lying child is asking for support. Looking for acceptance and only getting negative attention because they have a very hard time controlling their actions.
If this helps, my father and I set up a weekend once a month to do whatever I wanted, as long as it was something we could do together. We would go to breakfast, camping, fishing, bike rides, and even just sit together and have funny guy talks. I got to pick what we did as long as it was something we both could do. It helped a lot with some of my depression issues.
If your child is lying continuously, it’s more than likely unavoidable to get him to stop. However, I feel positive moments in your child’s life will definitely help eliminate the negative actions.
Hope my input is helpful. It makes me feel good to at least try and help others.