Is it normal that three guys from the same family like me??

So, I would use to go to this store, and this guy would be very nice and sweet-ish with me, yet he is VERY shy (though I don't see this behavior when he is around men.) Anyway, when a customer was trying to flirt with me when he was taking my order...long time ago, he got reaaally mad. I assume that out of jealousy, he might have said some bad things about me, because all of a sudden, I started getting attention (of the negative kind) from the other guy and the older man who worked there as well. They three seem to be family members. But as whatever their perception of me is none of my business as long as it doesn't affect me directly, I didn't really care about it and continued going there. So, as time passed by, I've had the two guys showing more serious interest in me, and lately, the older man is showing too much interest in me too (he interrupts when I'm talking to either of the other guys and starts talking to me, and the other day he said something in his language (none of us are American nor are we from the same continent) that I got translated, which said "come, I will give you my heart, girl." In their culture, they have to respect older people, and it seems to me that this man is marking territory there.) Now, the guy I mentioned in the beginning is really freaked out at the older man's behavior and seems pretty uncomfortable when I go to buy and the older man somehow tries to draw attention to himself. I don't know why, but I feel soo guilty about this. It's not the first time I have several guys "competing" for my attention (I don't even know what's about me that causes these weird situations really,) but they never were related by blood! Should I stop going there??