Thread:SpectrumRay16/@comment-26091443-20150923010347/@comment-26363301-20151118002630

If what you said is true then i could imagine Escanor getting infected with that and losing his body, or perhaps it won't affect Escanor as badly due to Sunshine but it will still destroy him internally? Estarossa having magic/a decree that can internally damage someone once they break his commandment would be the perfect counter against Escanor because i'd imagine that forcing Escanor's body to slowly die and get mangled around would be one way to kill him sucessfully. I did not notice this so it's nice you pointed it out :D

Since Zeldris is Meliodas and Estarossa's brother the likely option is that they are all related, perhaps fully or perhaps Estarossa is their half brother? I would imagine that they are all related regardless of the situation, Estarossa just doesn't see the need to talk to Meliodas.