Are they two different relationships?

My friend told me she can never have the relationship she does with her best friend, with her family members. Its not that she doesn't get along with them. On the contray, she has a sister her age who she is very close with but she said its not the same. Like there two diff things. Is it a shame or unusal to have a friendship with a family member like you would have with your closest friend. Or are they really two diff thing. Ur family is just that, Family, but they can never be your friends?
Updates:
+1 y
There a year and a few months apart in age.
Are they two different relationships?
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