Sirius and Remus Lupin were married and you were their adopted child and the death of the Potter's happened, they had adopted Harry Potter who was the age as you. For your eleventh birthday, the letter to Hogwarts never came, it was strange since the surrogate was indeed a witch but Harry's did come and he went to Hogwarts. Sirius slowly distanced himself from you since you were only a squib and focused himself on Harry, his pride and joy one could say. Remus still loved you dearly but it never really felt the same. You were in the kitchen, helping Remus prepare supper.