Need clarity on self-defense laws regarding repeated verbal aggression and personal space invasion

Location: Puerto Rico

Hi everyone, I’m looking for legal clarity on self-defense laws in Puerto Rico, specifically in situations involving ongoing verbal aggression and physical intimidation within a family setting.

I live with my grandmother, and a male family member often visits and verbally abuses her, screaming, belittling, and speaking in a degrading and aggressive tone. About two years ago, after enduring this for several hours during one visit, I finally stood up for her. During that argument, this person (who is much larger and male, while I am smaller and female) got inches from my face, yelling loudly. In response, I pushed him away from me. That was the extent of it, no punches, no further physical escalation.

Since then, I’ve tried to stay nearby when he visits to monitor how he speaks to her. He doesn’t like this, and we’ve had a couple more confrontations, including one today. I was quietly present, and it seemed to trigger him. He began yelling at me, accusing me of “supervising” him, and again got extremely close to me, invading my personal space to the point where my grandmother had to step between us. I stayed calm and didn’t touch him, but his behavior was clearly intimidating. The only thing I did was literally just standing there listening in.

I want to be prepared in case things ever escalate physically again. I’m not seeking to use deadly force, only to protect myself if I’m physically threatened, especially due to the significant size and strength difference, however if needed to I want to know what would be the limits to use for this type of setting and escalated matter, not sure if having a taller man in my personal space yelling would count as enough of a threat to use self-defense, in a court, if it came to that.

I’m a non-confrontational person, but this situation is emotionally draining and becoming increasingly hostile. My main question is:

Under Puerto Rico law, would I be legally justified in using physical force, such as pushing someone away, if they repeatedly invade my personal space and make me feel threatened? What if I needed to use an object (non-lethal) to defend myself? And in a worst-case scenario, would the use of deadly force ever be considered lawful in this kind of situation? I’m trying to understand where the legal boundaries are when it comes to self-defense in Puerto Rico, particularly when dealing with a larger, aggressive individual in a family setting. Would my response still be considered reasonable and legally protected under the law?

I care deeply for my grandmother and want to keep her safe, but I also don’t want to end up in legal trouble for reacting to a situation that has become unsafe and volatile.

TLDR:
In Puerto Rico. Male family member frequently verbally abuses my grandmother and gets aggressively close to me when I step in. I pushed him away once years ago when he screamed inches from my face. Today he did it again but I stayed calm. He’s much bigger, and I’m concerned about what’s considered legal self-defense in PR if he ever escalates physically. Just want to know my rights if I have to protect myself and my grandmother.