If someone doesn't have any friends outside of their family members but is still happy, it could mean a few different things:
Strong family bonds: It's possible that the person has very close and supportive relationships with their family members. These strong family bonds can provide a sense of belonging, love, and support, leading to happiness and contentment.
Introversion or preference for solitude: Some individuals are naturally more introverted or prefer spending time alone. They may find fulfillment and happiness in solitude or in smaller social circles. Having a few close family members with whom they share a strong connection might be sufficient for their social needs.
Self-sufficiency and independence: People who are happy without a large circle of friends might have developed a strong sense of self and are self-sufficient. They might be content with their own company and have learned to enjoy their own interests and activities.
Contentment with quality over quantity: Having a few close family members who truly understand and support you can be more fulfilling than having a large group of friends who might not be as connected or supportive.
Social anxiety or difficulty forming friendships: It's also possible that the person experiences social anxiety or finds it challenging to form new friendships. In such cases, they may have found comfort and happiness in their family relationships where the bond is already established.
It's important to remember that happiness is subjective and can vary greatly from person to person. While some individuals thrive in large social circles, others may find happiness in more intimate connections or even in solitude. What matters most is that the person feels content, supported, and emotionally fulfilled in their relationships, regardless of the number of friends they have. However, if the person feels distressed or isolated, it might be helpful for them to explore opportunities to meet new people and form connections outside of their family circle, if they desire to do so.