Questions & Answers about لما وصل عالبيت، اخي جاب كاسة مي من التلاجة.
Here لما means when and introduces a time clause: when he arrived home...
In Levantine, لما is very common in everyday speech. It often does the job that عندما does in more formal or Standard Arabic. So:
لما وصل... = when he arrived...
It is one of the most natural colloquial ways to set up a past event in a story.
The verb وصل is past tense, masculine singular: he arrived.
Arabic often leaves the subject pronoun unstated when the verb already shows it. So here there is an understood هو built into the verb.
That means وصل by itself can mean he arrived.
Who exactly he refers to depends on context. It could be my brother, or it could be someone already mentioned before this sentence.