Mae'n haf hwyr yng Nghymru.

It's late summer in Cymru.

Mae'r ysgol yn prysur baratoi ar gyfer dechrau'r tymor newydd.

The school is busy preparing for the start of the new term.

Mae'r llwyni'n llawn dail melyn cynnar.

The bushes are full of early yellow leaves.

Nid yw'r haul mor boeth mwyach, ac mae awel ysgafn yn chwythu trwy'r caeau gwyrdd ger yr Ysgol Uwchradd Gymunedol Gymraeg.

The sun isn't as hot anymore, and a gentle breeze is blowing through the green fields near the Ysgol Uwchradd Gymunedol Gymraeg.

Roedd Rhys yng nghanol y coridor hir, ei feddwl yn amharu.

Rhys was in the middle of the long corridor, his mind troubled.

Roedd mam a dad wedi gwahanu'n ddiweddar, ac roedd hynny'n effeithio arno.

His mom and dad had recently separated, and it was affecting him.

Roedd Cerys, ei chwaer fach, yn cerdded wrth ei ochr.

Cerys, his little sister, was walking by his side.

Roedd hi'n siarad â'i ffrindiau a chwerthin, ond roedd Rhys yn gwybod bod y chwerthin hwnnw yn cuddio teimladau tŷfnach.

She was talking to her friends and laughing, but Rhys knew that laughter was hiding deeper feelings.

Roedd hi'n syml mynd yn ôl i'r dosbarthiadau ar ôl y seibiant haf.

It was simple to go back to the classes after the summer break.

Roedd pawb yn dechrau sgwrsio am eu haf a dathliadau, ond Rhys a Cerys oedd yn ceisio symud ymlaen.

Everyone was starting to chat about their summer and celebrations, but Rhys and Cerys were trying to move on.

Roedd Rhys wir eisiau sicrhau bod Cerys yn iawn, ond roedd hi'n ymddangos fel petai'n osgoi'r mater.

Rhys really wanted to make sure Cerys was okay, but it seemed like she was avoiding the issue.

Un diwrnod, penderfynodd Rhys ei bod hi'n amser siarad â Cerys.

One day, Rhys decided it was time to talk to Cerys.

Yn ystod amser cinio, pan oedden nhw'n aros dan goeden fawr yng nghanol cae chwarae'r ysgol, cychwynnodd Rhys yr hyn roedd wedi bod yn ei ystyried am amser hir.

During lunchtime, when they were waiting under a big tree in the middle of the school's playing field, Rhys started what he had been considering for a long time.

"Cerys," dywedodd Rhys yn dawel, "sut wyt ti?

"Cerys," Rhys said quietly, "how are you?

Rydyn ni angen siarad am mam a dad.

We need to talk about mom and dad."

"Aeth chwerthin Cerys yn dawel.

Cerys's laughter quieted.

Trodd hi at Rhys.

She turned to Rhys.

Roedd ei llygaid yn llawn emosiwn.

Her eyes were full of emotion.

"Nid wyf yn gwybod, Rhys," meddai hi yn dawel, "rwy'n teimlo'n ddryslyd ac ofnus.

"I don't know, Rhys," she said quietly, "I feel confused and scared.

Ond rwy'n trio dangos fy mod i'n iawn.

But I'm trying to show that I'm okay."

"Daeth tawelwch byr rhwng y ddau.

A brief silence fell between the two.

Gwelodd Rhys y cyfle i fod yn frawd go iawn.

Rhys saw the chance to be a real brother.

"Mae'n iawn teimlo'n ofnus," meddai'n sydyn.

"It's okay to feel scared," he said suddenly.

"Gallwn ni helpu ein gilydd trwy hyn.

"We can help each other through this."

"Roedd y sgwrs honno fel pelydrau heulog yn torri trwy gymylau trwm.

That conversation was like sunbeams breaking through heavy clouds.

Roedd Cerys yn rhyddhau dagrau a siarad yn agored am ei hofnau.

Cerys shed tears and spoke openly about her fears.

Y diwrnod hwnnw, wrth iddynt adael yr ysgol, roedd y ddau yn teimlo'n agosach a chryfach.

That day, as they left school, they both felt closer and stronger.

Gwnaeth Rhys addo iddi eu bod nhw'n dîm.

Rhys promised her they were a team.

Byddai'n rhaid iddyn nhw wynebu beth bynnag oedd yn dod nesaf gyda'i gilydd.

They would have to face whatever came next together.

Roedd Rhys yn teimlo bod y pwysau'n llai, ac roedd Cerys yn teimlo'n llai ar ei phen ei hun.

Rhys felt the weight was less, and Cerys felt less alone.

Wrth i'r haul fachlud, a'r awel unwaith eto'n dod â'r arogl cyntaf o hydref, roedd y ddau, Rhys a Cerys, yn gwybod eu bod yn dechrau pennod newydd gyda'i gilydd.

As the sun set and the breeze once again brought the first scent of autumn, the two of them, Rhys and Cerys, knew they were beginning a new chapter together.