How can I though like that? =_=

Today I woke up when 7.30... Tuition again... ==
Today tuition is 8.00 until 11.00... But when 9.30, he let us watch a movie! ==
But the movie is very bored... But very surprise, they also gave us pop corn... Really like watching movie... LoL...
After tuition, a friend of mine (in tuition) she said wanna have lunch with me...
We go to my mom's restaurant there have our lunch...
After have our lunch... She gotta go... So I just say bye to her...
And then I continue stay at my mom's restaurant...
After a while, my mom asked me to go back home, cause dad today no work...
I went back home... I saw my sis is in the bath room... Of course take a bath la... ==
And then when she took bath already, wearing T-shirt with long jeans... I ask her...
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C = (of course is me) S = (of course is my sis)
~~~~~~~~~~~~~~~~~~~~~~~~~ OUR CHAT ~~~~~~~~~~~~~~~~~~~~~~~~~
C: Where you go?
S: School la!
C: So late?!
S: Today class late ma...
C: Oh... I see I see...
-------------------------------------------------------------------------------------
After we chat... She wanna go have a lunch with my dad... And by the way, she wants me to follow me... I was just like nod...
And in the restaurant... I never order any food... Cause I already ate with my friend... LoL...
And then when we order drinks... I wanna order Ice Milo... But I sure that my dad will scold me... So I was just 'order half'...
'Milo...' LoL... No dare continue the Ice...
My dad look at me fiercely... I don't wanna face him... I look another side...
What he ordered I also don't know... Cause don't want to hear... When the drinks came...
I saw got 1 is Ice Milo... I though is my sis's... So that time I got a bit jealous...
But when my sis take the Ice Milo to front of me... I was shock... And I saw she just order a sweet water... That time I feel I'm so... STUPID... ==
How can I though my dad partiality? I feel so sorry to them that I though like this... When that time my sis take the Ice Milo to front is me... I really got to cry out... But...
Aiyo... The restaurant too many people facing there... I can't... Paiseh... >_<