I put a tag on this of "Pentecostal" since "Oneness" nearly always belongs to Pentecostal these day.
"You're a mom, but you're also a daughter...these are different roles you play at different times, depending on the circumstance.
It breaks down:
1) the Father is Jesus' Father. If Jesus and His Father are the same person, I am my own mother. I am not my mother.
2) Jesus is the Son if God. I also am not my own daughter.
Where "mom" is the same person, relating to different people...
The Trinity is different persons relating to the same creation.