Absolutely — here’s a warm, genuine version:

She has cared for my son since he was just 10 months old, and over the years she has shown such genuine care and affection towards him. Knowing he is with someone who truly cares about his wellbeing gives us great peace of mind. He has also learned so much while in her care, and she is very intentional about supporting his learning and development in ways that are appropriate for his age. We are very grateful for the care and attention she gives him.