Is Blast Saitama's Dad?

The big reveal is that when Saitama finally meets him, he will put two and two together and find out that Blast is his dad.

Is Blast Saitama brother?

It is more likely that Saitama is Blast's brother, because of the time difference, as Saitama was 25 in the main series last time I checked. And what if Saitama was the second son without any pressure, because his family already had a child who continued the lineage.

Is Blast Saitama from the past?

While he's only appeared in flashbacks and silhouettes thus far, top-ranked S-Class hero Blast finally appears in the present in the latest chapter of One-Punch Man. In the process, he meets Saitama, potentially saving the incredibly powerful hero from the same malevolent force that gave Psychos her powers.