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"I live in a small house with my parents and my brother and sister"

In the sentence above, are supposed to use and article or a possessive pronoun before brother and sister?

...or while talking about father...

"I have a father. My father is a sculptor. I always talk to my/the father when I want to ask him something."

Do we need to use a definite article or a possessive pronoun?

and one more...

If somebody plays an instrument, can we say: "My favorite instrument is a cello and I play on it" Is this ON article correct?
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seroMack"I live in a small house with my parents and my brother and sister"
The sentence is correct but you could shorten it: I live in a small house with my parents, brother and sister.
seroMackI have a father.

Correct again, but rather odd. I don't know anybody that doesn't have a father, either dead or alive.
seroMackMy father is a sculptor. I always talk to my/the father when I want to ask him something."
Don't use the when you talk about your own father or mother. You could say: I talk to him when I want... (I don't understand how you could ask your father a question if you didn't talk to him, though. Perhaps you could e-mail him...
seroMack"My favorite instrument is a the cello and I can play on it"
)
I can play the piano.

He can't play the guitar. (But: He can play chess.)

He played that song on the piano.

CB
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No, "father" needs either an article or possessive pronoun.
His father, my father, the father and his son...

If you actually call him "Father" (like I say "Dad") the capitalize it, without the article.

"Father, where would you like to for dinner tonight?" - a direct form of address.
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Comments  
Cool BreezeCorrect again, but rather odd. I don't know anybody that doesn't have a father, either dead or alive.
seroMackMy father is a sculptor. I always talk to my/the father when I want to ask him something.
OK, but if I'd want to emphasize it? You know, e.g. to convince somebody that. I know it's sort of silly, I'm asking for grammatical correctness.
Cool BreezeDon't use the when you talk about your own father or mother. You could say: I talk to him when I want... (I don't understand how you could ask your father a question if you didn't talk to him, though. Perhaps you could e-mail him...
Yes, you're right and actually I knew that but I was curious if one could use a word father without any article/pronoun.

Thanks for clearing the rest!
 BarbaraPA's reply was promoted to an answer.
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