A father's child, a mother's child, yet no one's son.

Who am I?

Take one out and scratch my head, I am now black but once was red. What am I?

Who has married many women but was never married?

I welcome the day with a show of light, I stealthily came here in the night. I bathe the earthy stuff at dawn, But by noon, alas! I'm gone.

Until it is measured, not known. Yet how you miss it when it has gone. What is it?

What am I?

Spelt forwards I’m what you do every day, spelled backwards I’m something you hate. What am I?

When it is alive we sing, when it is dead we clap our hands. What is it?

I am first found in caves, now prolific online; I am a depiction, a drawing, a symbol, or sign. I will convey whichever mood you could wish; or for that matter, a fist, flask, or fish. What am I?

I am green and found in the forest and have needles instead of leaves. What am I?
Hint 1: It can be used for Christmas decorations.
Hint 2: I have a strong, scent that is used in air fresheners.