Based on the video redundant showed me, if you were to go back in time and see your mother, father in a younger age (14-20). They won't be classed as your mother and father since you aren't born yet in that time line. Meaning, they could fall in love with you and your mother/father could become your husband/wife and it wouldn't be classed as incest because in that time line, you haven't been born yet.
So does this mean if it wasn't for another time line, you would just disappear? If you never exist in the future, would you stay living without a mother/father or would you disappear?