Sibling
Parental effect

Children are more jealous of the interactions between newborns and their mothers than they are with newborns and their fathers. This is logical as up until the birth of the infant, the first-born child had the mother as their primary care-giver all to themselves. Some research has suggested that children display less jealous reactions over father-newborn interactions because fathers tend to punish negative emotion and are less tolerant than mothers of clinginess and visible distress, although this is hard to generalize.

Children that have parents with a better marital relationship are better at regulating their jealous emotions. Children are more likely to express jealousy when their parents are directing their attention to the sibling as opposed to when the parents are solely interacting with them. Parents who are involved in good marital communication help their children cope adaptively with jealousy. They do this by modelling problem-solving and conflict resolution for their children. Children are also less likely to have jealous feelings when they live in a home in which everyone in the family shares and expresses love and happiness.
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