Mother and daughter is far more likely, if there is any actual relation between them as most of us have doppelgangers not related to us in any way in the world, it just happens.
But world's first test tube baby was born 1978, that first sheep only in the late 1990s. Even if you assume both things had been going on longer than acknowledged artificial insemination in a test tube or petri dish is a lot easier, so if you want to secretly create somebody closely related to you, IVF would be the way to go.
What I would suspect does at least sometimes happen is people who want to keep their DNA around, or do the Genghis Khan thing and flood the world with theirs, but don't want to bother actually raising the kids themselves, is that they try to find a way to use those people who use IVF, or artificial insemination when the problem is with the man's sperm for it, if they can get access to facilities or individuals that offer those services in some way. After all there have now been several cases found where a doctor used his own sperm instead of taking it from the supply of donated stuff so it doesn't really seem all that farfetched to me.
Of course the easiest way is simply to donate eggs or sperm, but presumably there might be people who'd prefer to know who their offspring actually are, or to have more power over who the "adoptive" parents will be, or whose eggs or sperm are used to combine with theirs.
Mother and daughter is far more likely, if there is any actual relation between them as most of us have doppelgangers not related to us in any way in the world, it just happens.
But world's first test tube baby was born 1978, that first sheep only in the late 1990s. Even if you assume both things had been going on longer than acknowledged artificial insemination in a test tube or petri dish is a lot easier, so if you want to secretly create somebody closely related to you, IVF would be the way to go.
What I would suspect does at least sometimes happen is people who want to keep their DNA around, or do the Genghis Khan thing and flood the world with theirs, but don't want to bother actually raising the kids themselves, is that they try to find a way to use those people who use IVF, or artificial insemination when the problem is with the man's sperm for it, if they can get access to facilities or individuals that offer those services in some way. After all there have now been several cases found where a doctor used his own sperm instead of taking it from the supply of donated stuff so it doesn't really seem all that farfetched to me.
Mother and daughter is far more likely, if there is any actual relation between them as most of us have doppelgangers not related to us in any way in the world, it just happens.
But world's first test tube baby was born 1978, that first sheep only in the late 1990s. Even if you assume both things had been going on longer than acknowledged artificial insemination in a test tube or petri dish is a lot easier, so if you want to secretly create somebody closely related to you, IVF would be the way to go.