The thing I learned reading up on this subject is that alot of people confuse what is good for children with atributes that are comonly found with home ownership. Children do best under stable, loving households with active/attentive parents. Weither they pay rent or morgage is irrelevant, as long as all the bills are paid and constantant problems of insufficient money are not present in the house they will be fine. Higher income people tend to have more time and resources to dedicate to their household and children than lower income people, and this brings more stable atmospheres that allow for greater success. Ownership may be a common way to identify a stable household but it in no means is a qualification for one. Infact lower income (maybe just younger/less experienced) parents may do BETTER as renters if they are able to dedicate more resources to their childs upbringing by a reduced rent payment vs a morgage.
Whats most important is not the status of Owner or Renter, but the quality of the household the child is reared in and the level of dedication of the parents to the success of their child.