My mother had little negativity; my father, a lot. They had individual toxicity, but together, did not. They taught me the right and wrong way to be, but little is more brittle than me. What am I?

I can be a circle or half circle, clear or not, I will help you achieve an inclination, all from a dot.

In my family, Mom can eat any plate she sees, but her babies cannot eat more than two. Dad only ever has one plate, while each pet must have exactly three. Uncles eat in hallways and aunties eat on stairways. What is my family name?

I have never been, but always to be. No one ever has nor ever will be a witness to me. You cannot touch me or taste me, I neither grow nor decay, but if I did not exist you would all pass today.

In different forms I come, with me your day in never the same But spend too long with me, and I might drive you insane Without rhyme or reason you'll never catch me, no need to try So I ask you at once, what am I?