Hello & welcome to Just Answer! If you have any questions after reading my answer, be sure to let me know.
It is very likely that you too have suffered from the same condition,
I would like you to be evaluated by a doctor as soon as feasible,
and to start the antibiotic drops for his mother, and your self as appropriate in this situation
Keep the eyes clean by using a piece of sterile cotton with some water
Pink eye is quite a contagious disease, and it is not unusual for many family members to be infected at one time
Avoid using each others towels, liberally use hand sanitizers, and wear spectacles (zero number if needed) to avoid touching the infected eye repeatedly,
Let me know if you need more information,