@ACROSS ALL REALMS I REIGN SUPREME He says he took care of his siblings in place of his parents. It doesn't say on this page that his parents are dead. Unfortunately, when both parents work and they have more than one kid, the older/eldest can become parentified by the busy parents.
The Galactic Navy Officer Becomes an Adventurer
by Takuma Tomomasa , A_Itoh
Available on mangabuddy for reading, and for sale at https://www.amazon.com/dp/B0BT6V7CMM
by Takuma Tomomasa , A_Itoh
Available on mangabuddy for reading, and for sale at https://www.amazon.com/dp/B0BT6V7CMM