Augustus Gomez, 59, said the Three Lions defender is “doing okay" following the incident at St George's Park on Monday.
He also declared that his son just wants to “smile and be happy" while focusing on football and spending time with his family.
Augustus told the Mirror: “He wasn't expecting it, it happened, he brushed it away and he carried on. He trained today, he is fine apart from the scratch on his face.
“He is fine, he is definitely fine. I spoke to him, I spoke to his agent; let him just be happy and smiling and so-forth.
“He is very passionate about what he does.
He added: “We just want to see that Joe is happy, that his wife is happy, we are happy and that is it.
When asked if he was upset to hear of his son's scratch, he said: “It is normal. Young people are very ambitious and very willing to win for their team and that is what happens. If Liverpool were losing, one of the players would be agitated as well.
“Raheem Sterling - it is not his fault. Fans were agitating him and he took it out because of his frustration.
“We all understand that; it is football, we are human beings."