I think that the development of an internal working model plays a role in social relationships later on in life because it provides examples and expectations of what relationships should be. If a child grows up in a loving, happy home they will be able to recognize people and environments that provide the same feelings. They will also be able to recognize how to act in situations in a positive and comfortable way and this will add to their ability to form strong, healthy social relationships. While I think the attachments formed early in life can influence adjustments later in life I think there are other factors that contribute as well. The people that we encounter later in life can also influence how we act, whether this includes friends, romantic relationships, or work environments. How others treat us can effect how we act towards others and can alter the foundations of social relationships we developed early on in life. Also, children need to be able to be independent and have a secure attachment and good relationship with their caregivers without being too dependent on their presence and influence. We should be influenced by a good upbringing but also adapt depending on our later experiences and encounters.
