What's up with these kinds trying to bother me at the pool?

I live in a gated compound with a shared pool. I go to the pool every morning and do a few laps and chill. Recently I've been seeing these two siblings at the pool who seem to be below 10, they're always accompanied by their nanny. The first time I saw these boys I could immediately tell they were naughty and the older one comes off as a bully. I've noticed that the nanny often reprehends them for bad behavior.

The pool has a kids pool and an a main pool which is where I swim. These boys usually stay at the kids pool but as soon as the older one sees me entering the main pool I don't know why he tends to jump and swim really close to me. The nanny always shouts at him to not bother me but the kid ignores her. I never spoke to him or interacted with him but today I was about to lose it but I didn't say anything because as an adult I think I need to be the bigger person.

I was doing some laps and this boy would always try to do something silly or try to get closer, whenever I swam past him he would swim under water and at some point I accidentally kicked him, when I turned he embarrassingly laughed and I thought to myself maybe now he's going to stop disturbing me. I swam to the other side of the pool and the kid is there next to me in less than a minute.

At some point I was a bit tired and was just chilling on the side of the pool, this boy gets really close again and decides to hop outside the pool and nearly fell on me. The nanny saw this a yelled at him and they eventually left.

I nearly told him 'there's so much space in this pool why do you always have to swim so close to me and disturb me?' but I didn't, I know if someone have spoken to me that way when I was a kid it would hurt my feelings. I always make excuses for people's behaviors including kids, I started thinking that this boy maybe doesn't have enough attention at home and does all this naughty stuff to get people's attentions but is not my job to educate them or teach them good manners.

Updates
11 mo
What do you think I should do next time this happens? Ignore them or tell him to go away?
What's up with these kinds trying to bother me at the pool?
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