The comparative study was conducted purposively in Haryana and Uttarakhand states. Chamoli district from Uttarakhand and Bhiwani district from Haryana states were selected at random. From Chamoli block, Gair village and from Bhiwani block, Chang village was selected at random. Families with adults in the age range of 40-50 years were identified by snowball method. From each state urban and rural sample constituted of randomly selected 120 adults including 60 males and 60 females. The total sample constituted of 240 adults, 120 from Haryana and 120 from Uttarakhand (120 males and 120 females). Interview schedule was developed to obtain information on socio-personal variables. Adult Sibling Relationship scale by Nandwana and Katoch (2010) was used to assess sibling relationship of selected adults. Results revealed that majority of the adults from both the states had moderate level of contacts, emotional closeness, confiding and conflicts in relationships with their sibling. Regarding overall sibling relationship, majority of adults had loyal and congenial relationship with their siblings. There was no association between geographical location, area of residence, gender and overall sibling relationship. The findings have implications for adults in understanding relationship with their siblings during middle adulthood. | Sibling relationships during middle adulthood in Uttarakhand and Haryana: A comparative study