A child who was no siblings, is his or her parents’ entire focus when it comes to family and in many cases this can be quite apparent to those around.  Only children are often seen alone with one or both of their parents whether it be in the yard at home, at the park, at various events or activities, and at a variety of other places. 

Parents of only children seem to be able to attend their child’s sporting events or other activities because they don’t have more than one child in activities like parents with more than one child may have. 

This can trigger jealousy in other children who may have several siblings and who feel they have to work very hard just to get the attention of one parent, let alone two. 

When they see another child who seems to always have his or her parent(s) to him or herself, who will take him or her anywhere with them, it can simply seem unfair. 

People are jealous of only children also because of what they seem to have or get.  When parents only have one child, they can afford to spend a lot more on that one child than if they had two or more children. 

That child is likely to get more clothes, toys, and other things than a child with a few or many siblings would get, something that children and teenagers really notice.   

They don’t understand why that child gets to have everything to him or herself while they likely have to share most everything they have with their siblings in some way or another. 

When an only child grows up, parents are likely able to help him or her pay for college and other expenses associated with making the transition to adulthood and self-sufficiency if they choose to. 

More often than not, children who have siblings are likely not to get as much assistance from their parents because there are not as many resources to go around. 

These children will oftentimes feel jealous of the only children as they feel they are having to work harder and struggle more to get an education and get on with their adult life

Jealousy always roots back to someone feeling that they are being treated unfairly or unjustly.  People are jealous of only children because they come from different family situations than they do. 

They feel that it isn’t fair that only children seem to get more attention and resources from their parents than children with siblings.  However, when people are jealous of only children, they are not taking everything into consideration. 

They are not thinking about what only children do not have.  Only children do not have other children in their home to play with or learn from and they may feel lonely a lot of the time. 

They may also not enjoy all of the attention they get from their parents.  So while people may be jealous of only children, it’s likely that only children are jealous of children with siblings.