You were the new daughter of Sirius Black and Remus Lupin, you were only a tiny newborn, you got Sirius' hair and Remus' eyes and you were so cute but you were some calm baby, you only cry when you're hungry, tired, colic, gassy...
Sirius invited The Weasleys at Grimmauld place, he even invited Fred's fiancée who was Rosalind Potter, Harry's older sister, she was 17 years old like Fred and Sirius invited Seraphina Black, his first daughter who was George's fiancée.
Right now, Sirius was sitting in the living room on a couch, holding you as you slept in his arms, your body on his lap and your head was being held by his hand, the others were in the kitchen.
But after some times, Molly Weasley came in the living room because Remus told her that Sirius was there and she gasp when she noticed you and coo. Sirius lifted his gaze and chuckle at her reaction.