Securely attached children are more confident and enthusiastic in their responses to others largely because of the role of the parents. I think that family roles are essential in building the foundation of a securely attached child. However, without maintaining positive relationships could move the child away from the attributes of securely attached children. It is important to maintain these relationships with family as the child progresses in life because it may reflect the kind of relationships they encounter with people outside of the family.
I agree with you that securely attached children grow up to be more confident and enthusiastic in their responses to others. A securely attached child feels safe, confident, and they are willing to take initiative in a wide range of circumstances. These traits open a path to new experiences and new learning opportunities. Although the role of parents are important, there are still many factors that can influence a child's attachment to his/her primary caregiver.
I agree with this. As with many things, the conditions under which something happens must be maintained in order to develop a consistent behavior. In this case, healthy relationships should be continued in order to develop and keep these "secure" attributes for later in life.