Final answer:
It cannot be definitively determined whether only children are more narcissistic without further information. Narcissism in only children depends on various factors, and studies have yielded mixed results.
Step-by-step explanation:
The subject of whether only children are more narcissistic is complex and involves understanding personality development within a social and familial context. It is incorrect to make a blanket assertion that only children are more narcissistic. However, without additional information and research, it is not possible to definitively answer Yes or No to this question. Studies on this topic have yielded mixed results, with some suggesting that only children may have certain personality traits due to their unique upbringing, while others find no significant differences in narcissism when comparing only children to those with siblings. Sociological and psychological research must consider various factors including parenting styles, socio-economic status, cultural background, and many others that influence personality development.