I couldn't care less how many children someone has and am constantly flummoxed by the way in which people think that it is their place to criticize people who have only children and as a parent of an only child it is really starting to rile me.
I absolutely understand that there are many benefits to siblings, I have three myself whom I adore. However it is often painted as only positive and that everyone owes it to their child to give them a sibling. I am just posting this link to try to show the other side, that siblings aren't always positive and perhaps people should rein in their opinions.
Psychology Today