Small sex Organ. To get child in future?

Thank you for asking. I can understand the your concern. Let me clarify firstly, that the penis size has nothing to do with one being able to have a child or not. Size has nothing to do with fertility. Secondly, penis size is not so important for enjoying sex. Size upto 1.5 inches is sufficient for penetration. Fruitful is altogether a different concept. It also involves an art of seducing the partner, implementing correct techniques to stimulate and arouse the partner, understanding the basic differences in the physiology of male and female sexual responses, etc. Penis size does not make a difference. One should focus on learning understanding the ways to stimulate and seduce the partner if he wishes to enjoy a fruitful sex life.

For knowing how to approach an intercourse, and more information ask you out brother to  consult a sexologist.