Thanks Jeremy, During Spring Festival, we say 春节快乐 to each other, but different places have different way of saying it, such as in Beijing, native Beijinger would say someting like "您过好年啊"，but you know nowadays, Beijing is full of people from other province, and I remember once I heard an elderly said "过年好啊您"， I almost in tears, cos it's just sound so 亲切, I am not sure if intimate is the right word to describe it。 When I said my cousins' siblings, I actually mean my cousin's children, I guess I used it wrong then. When you said it isn't common to say things the way I said, is it I used really strange word or outdated word ?

FYI(for your information), most non Chinese don't know what Spring Festival is but many if not all know Chinese new year so it is best to call it that. 请问，过春年时，你们对别人说“春年快乐”还是新年快乐“？Aren't your cousins' siblings your cousins as well? You might be confusing the meaning of siblings because in China most young people don't have siblings and so often they will refer to their cousins by 姐姐，妹妹，哥哥，弟弟，大哥，etc whereas most americans wouldn't eve call their cousins brothers and sisters. PS your english is really correct but it isn't common to say things the way you did. It is really good and understandable though.