This is my top recommendation for 2 and 5 yo having trouble listening:
"GOYB Parenting"
It was written by someone who was a member of GCM wayyyyyy back in the day. I have found it indispensible, and it will be more effective than a L&L approach with those ages. L&L is better once a foundation of cause-effect has been laid, and a child with ADHD or who hasn't already internalized following parental directions will not be a good fit for Love & Logic.