You are wrong if you think I had only four sons, I have thousands of sons and daughters and in them I see the four I sacrificed. Those four sons were four virtues from Waheguru Ji, their body pots were to be smashed so that those virtues could be poured into the Khalsa.

Ajit means unconquerable, my Khalsa would rather die fighting than run like a coward.
Jujhar means warrior, my Khalsa is powerful and strong.
Zorawar means Power, as long as my Khalsa is distinct I will give them all of my power.
Fateh is victory, my Khalsa will fight for Waheguru's victory.
O Mata Jee, when I see one Khalsa with these 4 qualities I see all four sons.