They say my son has issues interacting with his peers but he plays with his older cousins. I notice he will only interact with older children. When he was born that's all he was surrounded by was his older cousins and us. When his sister was born he would barely look at her but he shows her some affection. He plays next to her and build blocks. When she cries he runs to give her the bottle or packs her back.
My grandson, when he was younger, preferred talking to adults; but he would interrupt them to talk. Started social cues daily.