All perfect praise be to Allah, The Lord of the Worlds. I testify that there is none worthy of worship except Allah, and that Muhammad is His slave and Messenger.
The basic principle is that concealing righteous deeds is more appropriate and closer to achieving sincerity. However, it is prescribed to show good deeds if there is a preponderant benefit in that, such as when a person refutes accusation, or that those who are lazy would imitate him in doing the same act.
Therefore, if informing your parents about what you did will please them, and this was your purpose and you are safe from showing off, or seeking reputation, then informing them with this purpose is a good deed for which you will hopefully be rewarded, Allah willing.
Allah knows best.