It is vital for your children to know about the companions of the Prophet ﷺ. They are excellent role models and also show the importance of good friendship. The best sahabah after all, were the Prophet's closest friends.
Prophet Muhammad ﷺ said: "The best people are those of my generation (the Saḥābah), and then those who will come after them (the next generation: tabi-'een)), and then those who will come after them (i.e. the next generation, "tabi-tabi'een)." -- authentic hadith from Sahih Bukhari.
The companions include those Muslims who were around the Prophetﷺ at the time. It includes the men, women and children who accompanied him (SAW). The best of the companions are thefour rightly guided caliphs(khulafa rashidoon): Abu Bakr, Umar, Uthmaan and Ali (may Allah have mercy on them all).
The companions played a crucial part in the preservation and spread of Islam. If one reads Islamic history, you will be astounded by how quickly and efficiently Islam spread within a matter of a few years. This success is attributed to the excellent leadership of the khulafa rashidoon.
The companions narrated the ahadith (statements and actions of the Prophetﷺ) with accuracy. In fact, one of the best hadith scholars was a lady, the Prophet's beloved wife, Ayesha (RA).
The companions' strong moral character is unparalleled and should be an inspiration for us all. They were human, thus not perfect - but we are all imperfect; this is part and parcel of the human condition. Read their stories to your children! Read about their lives! Encourage your children to look up to them! You and your kids will be inspired!