I had my kids in family daycare for precisely this reason. I like the idea of my boys (2 years age difference) growing up together. If they were in a daycare centre then they would be separated most of the day into age-groups. I want them to have a strong bond together and that was why I chose family daycare, where the carer has 4 children under the age of 5 (two of them were mine).

The boys are now 6 and 4 and are very close - I really think that being in daycare together (fulltime, as I work and am a single Mum) really helped their bond.

Just my opinion.