I bought Mog's Family of Cats for my granddaughter when she was about 12 months old as she absolutely loved the first Mog board book. My first thought was "what a boring book" but apparently it isn't boring if you're under 2!
The charming illustrations of different British short haired cats, all with their own personalities and environments with very little distracting detail in the background is perfect for under 18 months as it is easy for them to follow the story and understand the pictures.
The illustrations which show Mog as having different coloured parents, siblings and extended family members is great for normalising families like ours where there are lots of different colourings and members are not peas from the same pod.
I quickly learned to identify the cats by name so that in the final pages where all the cats introduced throughout the book are on the same pages, I could name each cat. The GD was enthralled with this naming and also in exploring the simple backgrounds to the main illustrations. As the reader or narrator you do have to make an effort to "sell" this story, but the effort is well worth it as this book became the GD's favourite for at least a year.
Suitable for very young children. Don't buy this for rising twos as they should be progressing on beyond this point, but if you've bought it for a child up to 18 months they will enjoy it until they are over 2 1/2.