<human>: This past week around midnight I've been hearing sounds of children running around and yelling in the apartment above me. As long as I've lived here, that apartment has been empty. A few nights ago I decided to run outside to see if I could find exactly where the noise was coming from. When I got outside I saw two kids running around in the empty apartment and an older man, probably their father, just chilling out on the balcony. This morning I heard someone yelling. When I looked outside, I saw their father looking up at the balcony calling their names. I'm guessing that he was trying to get into the building since he doesn't have a key, basically confirming my suspicions. 

My first thought was to let the landlord know, but after putting myself in his position, I'd hate to make things worse for them. I don't think anyone wants to live like that and maybe he's just in between jobs. I can only speculate on his position. On the other hand, he is definitely leaving his kids alone during the day time, one of them being no older than 3 and the other being maybe 5. I live in a fairly large city where I'm sure there are shelters or something for the homeless, but I'm also pretty sure that this guy doesn't speak English.

Do you guys thing I should let the landlord know, or just give the guy a little time?

Can you condense the text into a few key points?
<bot>: Single father and two young kids are squatting in the apartment  above me. He's leaving them during the day time and I'm not sure if I should let the landlord know or not.