Day 30 My dad hasnt came back with the milk yet.
My mom is now crying everytime she sees me.
Did I do something wrong?

No

Explanation:

Well, I think it's because your dad hasn't come back that your dad is crying and every time she looks at you it is a reminder of what he left.

Explanation:

i'm not sure i completely understand your question, but i will do my best.

i think the answer you are looking for is sequence. (see below)

a repeated melodic fragment would be best defined as repetition, while repeated chords (different or the same) could be a chord progression. however, you then mentioned the chord and melodic fragment beginning on higher or lower pitches, in that case, the answer could be best defined as a sequence. the definition of a sequence is as follows: "the restatement of a motif or longer melodic (or harmonic) passage at a higher or lower pitch in the same voice."

let me know if this !