I clone myself in the present. I'm a male, 18 years old. I build a time machine. I send my young clone of 1year old to the past, let's say 30 years in the past. He falls in love with my mother and marries her, and they have a female child. The female child grows up and meets me (original, not the clone) and falls in love with me and we have a female child. The female child grows up and using my time machine and knowing how to construct it in the past, marries the original me before I invent the time machine, and I kill her before she can tell me how to build the time machine.
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There are laws against that sort of thing (murder, incest, cloning humans, causality), so someone would probably get arrested.
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The solution to the Grandfather Paradox ( Yours is a variation) is in the Many Worlds/Universes Interpetation of Quantum Mechanics every time you change the past you snap to a new universe that includes that change leaving this universe (time-line) unchanged. When the time comes for killing anybody the Quantum Suicide effect kicks in and the "gun misfires"
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Ignoring all wider consequences and any resulting paradoxes...
You had to have built the machine in the first place, so you didn't need her to tell you, so if this version of you had the will, you probably would have had the knowledge. Although, I'm pretty sure that there could be complications arising from the incest... You sick, sick puppy.
...And now to ignore my original rules, another, more likely, permutation is that this is so paradoxical that you don't exist, you as you were never born and hence your clone will cease to exist as soon as your mum falls in love with him. This will break her heart so much that she isn't much in the mood when your dad comes around. So It's probably best to not send a randy clone back into the past with your mum's photo.
I could carry on forever giving different, possible outcomes, but really what it comes to is the fact it could never happen. You could go forward, but not back. Of course THAT'S assuming time is the linear entity that we perceive it to be...
You had to have built the machine in the first place, so you didn't need her to tell you, so if this version of you had the will, you probably would have had the knowledge. Although, I'm pretty sure that there could be complications arising from the incest... You sick, sick puppy.
...And now to ignore my original rules, another, more likely, permutation is that this is so paradoxical that you don't exist, you as you were never born and hence your clone will cease to exist as soon as your mum falls in love with him. This will break her heart so much that she isn't much in the mood when your dad comes around. So It's probably best to not send a randy clone back into the past with your mum's photo.
I could carry on forever giving different, possible outcomes, but really what it comes to is the fact it could never happen. You could go forward, but not back. Of course THAT'S assuming time is the linear entity that we perceive it to be...