كل ما الولد يضحك، اخته تضحك معاه وعايزة ترقص.

No. In this sentence, كل ما is a fixed expression meaning whenever or every time.

So:

• كل ما الولد يضحك = whenever the boy laughs
• It introduces something that happens repeatedly, not just once.

A good way to learn it is as one chunk: كل ما = every time / whenever.

That is a very common question. In Egyptian Arabic, the bi- prefix is very common for the ordinary present/habitual tense, but after some words and expressions, the verb often appears without bi-.

كل ما is one of those environments.

So here:

• كل ما الولد يضحك
• اخته تضحك

sound natural with the bare imperfect.

A learner will often first expect بيضحك / بتضحك, but after كل ما, the form without bi- is very normal.

Yes, تـ can mean more than one thing in the present tense.

In Egyptian Arabic, تضحك can mean:

• you laugh (masculine singular)
• she laughs

The subject tells you which one is intended. Here the subject is أخته = his sister, so تضحك clearly means she laughs.

The same thing happens later with ترقص: because the subject is the sister, it means she dances / she wants to dance, not you dance.

It is built from:

• أخت = sister
• ـه = his

So:

• أخته = his sister

This is very common in Arabic: possession is often shown by attaching a pronoun suffix directly to the noun.

Some useful comparisons:

• أختي = my sister
• أختك = your sister
• أخته = his sister
• أختها = her sister

معاه means with him in Egyptian Arabic.

It is the Egyptian form corresponding to MSA معه.

So:

• مع = with
• معاه = with him

This -اه shape is very common in Egyptian after some prepositions and words. For example:

• معايا = with me
• معاك = with you
• معاها = with her

So تضحك معاه means she laughs with him.

Yes. معاه means with him, so the sense is shared laughter.

If you wanted laugh at him, Egyptian Arabic would usually use something like:

• تضحك عليه

So the preposition matters a lot:

• معاه = with him
• عليه = at him / on him

Because the subject is feminine: his sister.

In Egyptian Arabic, عايز / عايزة means wanting / wants, and it agrees with the person it describes:

• هو عايز = he wants
• هي عايزة = she wants

Since أخته is feminine, the sentence uses عايزة.

In Egyptian Arabic, after عايز / عايزة, the next verb usually comes directly in the imperfect form. There is no separate word that corresponds exactly to English to.

So:

• عايزة ترقص = she wants to dance

Literally, it is more like:

• she-want dance

This is a very common Egyptian pattern:

• أنا عايز آكل = I want to eat
• هي عايزة تروح = she wants to go
• احنا عايزين نتكلم = we want to talk

Yes, many speakers do. Both عايزة and عاوزة are used in Egyptian Arabic.

So both of these are possible:

• هي عايزة ترقص
• هي عاوزة ترقص

They mean the same thing: she wants to dance.

Which one you hear more depends a bit on region, speaker, and personal style. For a learner, it is good to recognize both.

It is the normal Arabic and.

So the second part says that his sister does two things:

• تضحك معاه = she laughs with him
• وعايزة ترقص = and she wants to dance

In natural English, depending on context, you might feel it as and or even and then / and also, but grammatically it is just the ordinary connector و.

A rough Egyptian pronunciation would be:

kull ma l-walad yiḍḥak, oxto tiḍḥak maʿāh wi-ʿāyza tirʔoṣ

A few sound notes:

• خ in أخته is like the sound in Scottish loch or German Bach
• ح in يضحك is a stronger, breathier h
• ق in ترقص is often pronounced as a glottal stop in Cairene Egyptian, so tirʔoṣ

Also, in fast speech, و often sounds like wi before another consonant, so و عايزة may sound like wi-ʿāyza.

كل ما usually gives the idea of every time / whenever, so it suggests repetition.

• كل ما الولد يضحك... = whenever the boy laughs...

By contrast, لما often means when, and it can refer to one specific occasion or event, depending on context.

So if you want the clear idea of something that happens again and again, كل ما is the better choice here.

Because Arabic often leaves the subject unstated when it is already clear from context.

Here, after أخته تضحك معاه, the listener already knows we are still talking about his sister, so وعايزة ترقص is enough.

You could repeat the subject for extra emphasis or clarity:

• وأخته عايزة ترقص

But it is not necessary. The shorter version sounds natural.