You can learn a lot in family situations.  When I was a child, my older brother and sister were going to the store, with mum and dad, where they were to choose their own bicycles.  Prior to this, it had been explained very carefully to me, that at this stage, there wasn't quite enough money around for my bicycle.

Obviously I would have been very excited also to receive my (first) bicycle and was hugely disappointed I was not to be included.  However my parents were very clever in the way they handled this.  I was to be given a paper dress-the-doll in the meantime, while I waited.  My attention was thus focused on the toy I had been given; and when the time eventually arrived where I also had in my possession "a brand new bicycle", I realised that, with some patience, one can actually receive a little more than one asks for.

I refer to an interesting article : Science Magazine 26 May 1989 - Mischel et all. pp933-938:

"To function effectively, individuals must voluntarily postpone immediate gratification and persist in goal-directed behaviour for the sake of later outcomes.  The present research program anaylised the nature of this type of future-oriented self control and the psychological processes that underlie it.  Enduring individual differences in self-control were found as early as the pre-school years.

The 4-year old children who delayed gratification longer in certain laboratory situations developed into more cognititively and socially competent adolescents, achieving higher scholastic performance and coping better with frustration and stress.

Experiments in the same research program also identified special cognitive and attentional processes that allow effective self-regulation early in the course of development.  The experimental results in turn, specified the particular types of pre-school delay situations diagnostic for predicting aspects of cognitive and social competence later in life."