Not according to any of my firearms instructors.
The report of pushing the grandfather out of the way is a one sided opinion. you added “punching”.
There was a legal agreement from both parents where the father had every legal right to take the kids for a visit. The grandfather and the mother violated that legal agreement.
Umm, I didn’t “add” punching, I read the article.
“As the two left the home out to the driveway, Boudreaux again pushed the older man and allegedly struck him in the chest area where he recently had a pacemaker inserted, “
STRUCK him in the chest area sounds like punching to me. But what do I know, maybe it was a love tap.