I mentally consider my boyfriend's family as my family. His nephews are my nephews. His parents are my in-laws. His sister and brother are my brother and sister in law. His brother in law's family is my extended family of some sort. They might as well be since we went to two Christmas get togethers with them this year. His brother in law's stepmom requested an invitation to our future wedding. I really do appreciate how welcome they've made me feel in a pretty short amount of time. I don't always know how to show it since I'm so shy, but I do love them.