please help me to correct, thank you.

[Unregistered]

1) I missed seeing Bradd Pitt at the party, so i will go to the same party again this year to see him.
2) My sister missed seeing father when she came back, so she will make sure she don;t miss seeing him this time.

[zeyarag]

How about changing "missed seeing" to "missed a/the chance to see" ?

[wmuench]

1) I missed seeing Bradd Pitt at the party, so i will go to the same party again this year to see him.
2) My sister missed seeing father when she came back, so she will make sure she don;t miss seeing him this time.

I'm not sure what in particular you'd like corrected but 'Brad' is only on 'd' and 'i' should be capitalized to 'I'.

Otherwise I see nothing wrong with the first sentence grammatically.

Sentence 2 has two errors.

1.You have inserted a semi-colon where an apostrophe should be.
The word don't represents do not, (the apostrophe between n + t indicates the missing letter) A semi-colon (;) has a different use, that of joining sentences.

2.The correct word here is doesn't (not don't).

"My sister missed seeing father when she came back, so she will make sure she doesn't miss seeing him this time."

Don't: used for I, you, we, they
Doesn't: used for he, she, it

I'm not a teacher so can't explain why, but am interested if someone does!

[Raymott]

My sister missed seeing father

My sister missed seeing our father ... OR
My sister missed seeing Father ... (Father is a name here).